Actual useful multi-runtime

Note: it's not yet exposed in Per-Version-Config and doesn't select automatically for versions that require certain runtimes

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/BaseLauncherActivity.java

@@ -234,10 +234,10 @@ public abstract class BaseLauncherActivity extends BaseActivity {
         }
         System.out.println("call to onResumeFragments; E");
     }
-    public String getFileName(Uri uri) {
+    public static String getFileName(Context ctx, Uri uri) {
         String result = null;
         if (uri.getScheme().equals("content")) {
-            Cursor cursor = getContentResolver().query(uri, null, null, null, null);
+            Cursor cursor = ctx.getContentResolver().query(uri, null, null, null, null);
             try {
                 if (cursor != null && cursor.moveToFirst()) {
                     result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));
@@ -268,9 +268,11 @@ public abstract class BaseLauncherActivity extends BaseActivity {
                     barrier.show();
                     Thread t = new Thread(()->{
                         try {
-                            MultiRTUtils.installRuntimeNamed(getContentResolver().openInputStream(uri), getFileName(uri),
+                            String name = getFileName(this,uri);
+                            MultiRTUtils.installRuntimeNamed(getContentResolver().openInputStream(uri), name,
                                     (resid, stuff) -> BaseLauncherActivity.this.runOnUiThread(
                                             () -> barrier.setMessage(BaseLauncherActivity.this.getString(resid,stuff))));
+                            MultiRTUtils.postPrepare(BaseLauncherActivity.this, name);
                         }catch (IOException e) {
                             Tools.showError(BaseLauncherActivity.this
                                     ,e);

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/BaseMainActivity.java

@@ -20,6 +20,7 @@ import java.nio.ByteBuffer;
 import java.nio.FloatBuffer;
 import java.util.*;
 import net.kdt.pojavlaunch.customcontrols.*;
+import net.kdt.pojavlaunch.multirt.MultiRTUtils;
 import net.kdt.pojavlaunch.prefs.*;
 import net.kdt.pojavlaunch.utils.*;
 import net.kdt.pojavlaunch.value.*;
@@ -129,6 +130,7 @@ public class BaseMainActivity extends LoggableActivity {
             // FIXME: is it safe fot multi thread?
             GLOBAL_CLIPBOARD = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
 
+            MultiRTUtils.setRuntimeNamed(this,LauncherPreferences.PREF_DEFAULT_RUNTIME);
             logFile = new File(Tools.DIR_GAME_HOME, "latestlog.txt");
             logFile.delete();
             logFile.createNewFile();

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/JavaGUILauncherActivity.java

@@ -9,6 +9,8 @@ import android.widget.*;
 
 import java.io.*;
 import java.util.*;
+
+import net.kdt.pojavlaunch.multirt.MultiRTUtils;
 import net.kdt.pojavlaunch.prefs.*;
 import net.kdt.pojavlaunch.utils.*;
 import org.lwjgl.glfw.*;
@@ -63,11 +65,13 @@ public class JavaGUILauncherActivity extends LoggableActivity implements View.On
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        
         setContentView(R.layout.install_mod);
 
         Tools.updateWindowSize(this);
         
         try {
+            MultiRTUtils.setRuntimeNamed(this,LauncherPreferences.PREF_DEFAULT_RUNTIME);
             gestureDetector = new GestureDetector(this, new SingleTapConfirm());
 
             findViewById(R.id.installmod_mouse_pri).setOnTouchListener(this);

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/PojavApplication.java

@@ -55,7 +55,7 @@ public class PojavApplication extends Application
 			Tools.APP_NAME = getResources().getString(R.string.app_short_name);
 			
 			Tools.DIR_DATA = getDir("files", MODE_PRIVATE).getParent();
-            Tools.DIR_HOME_JRE = Tools.DIR_DATA + "/jre_runtime".replace("/data/user/0", "/data/data");
+            //Tools.DIR_HOME_JRE = Tools.DIR_DATA + "/jre_runtime".replace("/data/user/0", "/data/data");
             Tools.DIR_ACCOUNT_OLD = Tools.DIR_DATA + "/Users";
             Tools.DIR_ACCOUNT_NEW = Tools.DIR_DATA + "/accounts";
             // Tools.FILE_ACCOUNT_JSON = getFilesDir().getAbsolutePath() + "/account_profiles.json";

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/PojavLoginActivity.java

@@ -2,7 +2,10 @@ package net.kdt.pojavlaunch;
 
 import android.Manifest;
 import android.annotation.SuppressLint;
+import android.app.Activity;
 import android.app.Dialog;
+import android.app.ProgressDialog;
+import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
@@ -40,6 +43,7 @@ import android.widget.Spinner;
 import android.widget.TextView;
 import android.widget.Toast;
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.appcompat.app.AlertDialog;
 import androidx.core.app.ActivityCompat;
 import androidx.core.content.ContextCompat;
@@ -62,6 +66,8 @@ import net.kdt.pojavlaunch.authenticator.mojang.LoginTask;
 import net.kdt.pojavlaunch.authenticator.mojang.RefreshListener;
 import net.kdt.pojavlaunch.customcontrols.ControlData;
 import net.kdt.pojavlaunch.customcontrols.CustomControls;
+import net.kdt.pojavlaunch.multirt.MultiRTConfigDialog;
+import net.kdt.pojavlaunch.multirt.MultiRTUtils;
 import net.kdt.pojavlaunch.prefs.LauncherPreferences;
 import net.kdt.pojavlaunch.utils.JREUtils;
 import net.kdt.pojavlaunch.utils.LocaleUtils;
@@ -278,17 +284,6 @@ public class PojavLoginActivity extends BaseActivity
         PojavProfile.setCurrentProfile(this, null);
     }
 
-    private boolean isJavaRuntimeInstalled(AssetManager am) {
-        boolean prefValue = firstLaunchPrefs.getBoolean(PREF_IS_INSTALLED_JAVARUNTIME, false);
-        try {
-            return prefValue && (
-                am.open("components/jre/bin-" + Tools.CURRENT_ARCHITECTURE.split("/")[0] + ".tar.xz") == null ||
-                Tools.read(new FileInputStream(Tools.DIR_HOME_JRE+"/version")).equals(Tools.read(am.open("components/jre/version"))));
-        } catch(IOException e) {
-            Log.e("JVMCtl","failed to read file",e);
-            return prefValue;
-        }
-    }
    
     private void unpackComponent(AssetManager am, String component) throws IOException {
         File versionFile = new File(Tools.DIR_GAME_HOME + "/" + component + "/version");
@@ -368,204 +363,65 @@ public class PojavLoginActivity extends BaseActivity
             
             unpackComponent(am, "caciocavallo");
             unpackComponent(am, "lwjgl3");
-            if (!isJavaRuntimeInstalled(am)) {
+            if(!installRuntimeAutomatically(am,MultiRTUtils.getRuntimes().size() > 0)) {
-                if(!installRuntimeAutomatically(am)) {
+               MultiRTConfigDialog.openRuntimeSelector(this, MultiRTConfigDialog.MULTIRT_PICK_RUNTIME_STARTUP);
-                    File jreTarFile = selectJreTarFile();
+                synchronized (mLockSelectJRE) {
-                    uncompressTarXZ(jreTarFile, new File(Tools.DIR_HOME_JRE));
+                    mLockSelectJRE.wait();
-                } else {
-                    Tools.copyAssetFile(this, "components/jre/version", Tools.DIR_HOME_JRE + "/","version", true);
                 }
-                firstLaunchPrefs.edit().putBoolean(PREF_IS_INSTALLED_JAVARUNTIME, true).commit();
             }
-            
-            JREUtils.relocateLibPath(this);
-
-            File ftIn = new File(Tools.DIR_HOME_JRE, Tools.DIRNAME_HOME_JRE + "/libfreetype.so.6");
-            File ftOut = new File(Tools.DIR_HOME_JRE, Tools.DIRNAME_HOME_JRE + "/libfreetype.so");
-            if (ftIn.exists() && (!ftOut.exists() || ftIn.length() != ftOut.length())) {
-                ftIn.renameTo(ftOut);
-            }
-            
-            // Refresh libraries
-            copyDummyNativeLib("libawt_xawt.so");
-            // copyDummyNativeLib("libfontconfig.so");
         }
         catch(Throwable e){
             Tools.showError(this, e);
         }
     }
 
-    private boolean installRuntimeAutomatically(AssetManager am) {
-        try {
-            am.open("components/jre/version");
-        } catch (IOException e) {
-            Log.e("JREAuto", "JRE was not included on this APK.", e);
-            return false;
-        }
-        
-        File rtUniversal = new File(Tools.DIR_HOME_JRE+"/universal.tar.xz");
-        File rtPlatformDependent = new File(Tools.DIR_HOME_JRE+"/cust-bin.tar.xz");
-        if(!new File(Tools.DIR_HOME_JRE).exists()) new File(Tools.DIR_HOME_JRE).mkdirs(); else {
-            //SANITY: remove the existing files
-            for (File f : new File(Tools.DIR_HOME_JRE).listFiles()) {
-                if (f.isDirectory()){
-                    try {
-                        FileUtils.deleteDirectory(f);
-                    } catch(IOException e1) {
-                        Log.e("JREAuto","da fuq is wrong wit ur device? n2",e1);
-                    }
-                } else{
-                    f.delete();
-                }
-            }
-        }
-        InputStream is;
-        FileOutputStream os;
-        try {
-            is = am.open("components/jre/universal.tar.xz");
-            os = new FileOutputStream(rtUniversal);
-            IOUtils.copy(is,os);
-            is.close();
-            os.close();
-            uncompressTarXZ(rtUniversal, new File(Tools.DIR_HOME_JRE));
-        } catch (IOException e){
-            Log.e("JREAuto","Failed to unpack universal. Custom embedded-less build?",e);
-            return false;
-        }
-        try {
-            is = am.open("components/jre/bin-" + Tools.CURRENT_ARCHITECTURE.split("/")[0] + ".tar.xz");
-            os = new FileOutputStream(rtPlatformDependent);
-            IOUtils.copy(is, os);
-            is.close();
-            os.close();
-            uncompressTarXZ(rtPlatformDependent, new File(Tools.DIR_HOME_JRE));
-        } catch (IOException e) {
-            // Something's very wrong, or user's using an unsupported arch (MIPS phone? ARMv6 phone?),
-            // in both cases, redirecting to manual install, and removing the universal stuff
-            for (File f : new File(Tools.DIR_HOME_JRE).listFiles()) {
-                if (f.isDirectory()){
-                    try {
-                        FileUtils.deleteDirectory(f);
-                    } catch(IOException e1) {
-                        Log.e("JREAuto","da fuq is wrong wit ur device?",e1);
-                    }
-                } else{
-                    f.delete();
-                }
-            }
-            return false;
-        }
-        return true;
-    }
-    private void copyDummyNativeLib(String name) throws Throwable {
-        File fileLib = new File(Tools.DIR_HOME_JRE, Tools.DIRNAME_HOME_JRE + "/" + name);
-        fileLib.delete();
-        FileInputStream is = new FileInputStream(new File(getApplicationInfo().nativeLibraryDir, name));
-        FileOutputStream os = new FileOutputStream(fileLib);
-        IOUtils.copy(is, os);
-        is.close();
-        os.close();
-    }
-    
-    private File selectJreTarFile() throws InterruptedException {
-        final StringBuilder selectedFile = new StringBuilder();
-        
-        runOnUiThread(new Runnable() {
     @Override
-            public void run() {
+    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
-                AlertDialog.Builder builder = new AlertDialog.Builder(PojavLoginActivity.this);
+        super.onActivityResult(requestCode, resultCode, data);
-                builder.setTitle(getString(R.string.alerttitle_install_jre, Tools.CURRENT_ARCHITECTURE));
+        if(requestCode == MultiRTConfigDialog.MULTIRT_PICK_RUNTIME_STARTUP && resultCode == Activity.RESULT_OK) {
-                builder.setCancelable(false);
+            if (data != null) {
-
+                final Uri uri = data.getData();
-                final AlertDialog dialog = builder.create();
+                Thread t = new Thread(()->{
-                FileListView flv = new FileListView(dialog, "tar.xz");
+                    try {
-                flv.setFileSelectedListener(new FileSelectedListener(){
+                        MultiRTUtils.installRuntimeNamed(getContentResolver().openInputStream(uri), BaseLauncherActivity.getFileName(this,uri),
-
+                                (resid, stuff) ->PojavLoginActivity.this.runOnUiThread(
-                        @Override
+                                        () -> startupTextView.setText(PojavLoginActivity.this.getString(resid,stuff))));
-                        public void onFileSelected(File file, String path) {
-                            selectedFile.append(path);
-                            dialog.dismiss();
-
                         synchronized (mLockSelectJRE) {
                             mLockSelectJRE.notifyAll();
                         }
-
+                    }catch (IOException e) {
+                        Tools.showError(PojavLoginActivity.this
+                                ,e);
                     }
                 });
-                dialog.setView(flv);
+                t.start();
-                dialog.show();
             }
-        });
-        
-        synchronized (mLockSelectJRE) {
-            mLockSelectJRE.wait();
         }
-        
-        return new File(selectedFile.toString());
     }
-
+    private boolean installRuntimeAutomatically(AssetManager am, boolean otherRuntimesAvailable) {
-    private void uncompressTarXZ(final File tarFile, final File dest) throws IOException {
+        /* Check if JRE is included */
-
+        String rt_version = null;
-        dest.mkdirs();
+        String current_rt_version = MultiRTUtils.__internal__readBinpackVersion("Internal");
-        TarArchiveInputStream tarIn = null;
-
-        tarIn = new TarArchiveInputStream(
-            new XZCompressorInputStream(
-                new BufferedInputStream(
-                    new FileInputStream(tarFile)
-                )
-            )
-        );
-
-        TarArchiveEntry tarEntry = tarIn.getNextTarEntry();
-        // tarIn is a TarArchiveInputStream
-        while (tarEntry != null) {
-            /*
-             * Unpacking very small files in short time cause
-             * application to ANR or out of memory, so delay
-             * a little if size is below than 20kb (20480 bytes)
-             */
-            if (tarEntry.getSize() <= 20480) {
         try {
-                    // 40 small files per second
+            rt_version = Tools.read(am.open("components/jre/version"));
-                    Thread.sleep(25);
+        } catch (IOException e) {
-                } catch (InterruptedException e) {}
+            Log.e("JREAuto", "JRE was not included on this APK.", e);
         }
-            final String tarEntryName = tarEntry.getName();
+        if(current_rt_version == null && otherRuntimesAvailable) return true; //Assume user maintains his own runtime
-            runOnUiThread(new Runnable(){
+        if(rt_version == null) return false;
-                @SuppressLint("StringFormatInvalid")
+        if(!current_rt_version.equals(rt_version)) { //If we already have an integrated one installed, check if it's up-to-date
-                @Override
-                public void run() {
-                    startupTextView.setText(getString(R.string.global_unpacking, tarEntryName));
-                }
-            });
-            // publishProgress(null, "Unpacking " + tarEntry.getName());
-            File destPath = new File(dest, tarEntry.getName()); 
-            if (tarEntry.isSymbolicLink()) {
-                destPath.getParentFile().mkdirs();
             try {
-                    // android.system.Os
+                MultiRTUtils.installRuntimeNamedBinpack(am.open("components/jre/universal.tar.xz"), am.open("components/jre/bin-" + Tools.CURRENT_ARCHITECTURE.split("/")[0] + ".tar.xz"), "Internal", rt_version,
-                    // Libcore one support all Android versions
+                        (resid, vararg) -> {
-                    Os.symlink(tarEntry.getName(), tarEntry.getLinkName());
+                            runOnUiThread(()->{startupTextView.setText(getString(resid,vararg));});
-                } catch (Throwable e) {
+                        });
-                    e.printStackTrace();
+                MultiRTUtils.postPrepare(PojavLoginActivity.this,"Internal");
+                return true;
+            }catch (IOException e) {
+                Log.e("JREAuto", "Internal JRE unpack failed", e);
+                return false;
             }
-
+        }else return true; // we have at least one runtime, and it's compartible, good to go
-            } else if (tarEntry.isDirectory()) {
-                destPath.mkdirs();
-                destPath.setExecutable(true);
-            } else if (!destPath.exists() || destPath.length() != tarEntry.getSize()) {
-                destPath.getParentFile().mkdirs();
-                destPath.createNewFile();
-                
-                FileOutputStream os = new FileOutputStream(destPath);
-                IOUtils.copy(tarIn, os);
-                os.close();
-
-            }
-            tarEntry = tarIn.getNextTarEntry();
-        }
-        tarIn.close();
     }
 
     private static boolean mkdirs(String path)

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/multirt/MultiRTConfigDialog.java

@@ -1,5 +1,6 @@
 package net.kdt.pojavlaunch.multirt;
 
+import android.app.Activity;
 import android.app.AlertDialog;
 import android.content.Context;
 import android.content.DialogInterface;
@@ -13,7 +14,7 @@ import net.kdt.pojavlaunch.R;
 
 public class MultiRTConfigDialog {
     public static final int MULTIRT_PICK_RUNTIME = 2048;
-    public static final int MULTIRT_PICK_RUNTIME_NORETURN = 2049;
+    public static final int MULTIRT_PICK_RUNTIME_STARTUP = 2049;
     public AlertDialog dialog;
     public RecyclerView dialogView;
     public void prepare(BaseLauncherActivity ctx) {
@@ -29,10 +30,7 @@ public class MultiRTConfigDialog {
             @Override
             public void onClick(DialogInterface dialog, int which) {
                 /* Initialte import */
-                Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
+                openRuntimeSelector(ctx,MULTIRT_PICK_RUNTIME);
-                intent.addCategory(Intent.CATEGORY_OPENABLE);
-                intent.setType("application/x-xz");
-                ctx.startActivityForResult(intent,MULTIRT_PICK_RUNTIME);
             }
         });
         builder.setNegativeButton(R.string.mcn_exit_call, new DialogInterface.OnClickListener() {
@@ -46,4 +44,10 @@ public class MultiRTConfigDialog {
     public void refresh() {
         dialogView.getAdapter().notifyDataSetChanged();
     }
+    public static void openRuntimeSelector(Activity ctx, int code) {
+        Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
+        intent.addCategory(Intent.CATEGORY_OPENABLE);
+        intent.setType("application/x-xz");
+        ctx.startActivityForResult(intent,code);
+    }
 }

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/multirt/MultiRTUtils.java

@@ -1,11 +1,14 @@
 package net.kdt.pojavlaunch.multirt;
 
 import android.annotation.SuppressLint;
+import android.content.Context;
 import android.system.Os;
 import android.util.Log;
 
+import net.kdt.pojavlaunch.PojavLoginActivity;
 import net.kdt.pojavlaunch.R;
 import net.kdt.pojavlaunch.Tools;
+import net.kdt.pojavlaunch.utils.JREUtils;
 
 import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
 import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
@@ -31,6 +34,7 @@ public class MultiRTUtils {
         }
         public String name;
         public String versionString;
+        public String arch;
         public int javaVersion;
     }
     public static interface ProgressReporterThingy {
@@ -38,6 +42,7 @@ public class MultiRTUtils {
     }
     private static File runtimeFolder = new File(Tools.MULTIRT_HOME);
     private static final String JAVA_VERSION_str = "JAVA_VERSION=\"";
+    private static final String OS_ARCH_str = "OS_ARCH=\"";
     public static List<Runtime> getRuntimes() {
         ArrayList<Runtime> ret = new ArrayList<>();
         System.out.println("Fetch runtime list");
@@ -61,6 +66,67 @@ public class MultiRTUtils {
         tmp.delete();
         return read(name);
     }
+    private static void __installRuntimeNamed__NoRM(InputStream runtimeInputStream, File dest, ProgressReporterThingy thingy) throws IOException {
+        File tmp = new File(dest,"temporary");
+        FileOutputStream fos = new FileOutputStream(tmp);
+        thingy.reportStringProgress(R.string.multirt_progress_caching);
+        IOUtils.copy(runtimeInputStream,fos);
+        fos.close();
+        runtimeInputStream.close();
+        uncompressTarXZ(tmp,dest,thingy);
+        tmp.delete();
+    }
+    public static void postPrepare(Context ctx, String name) throws IOException {
+        File dest = new File(runtimeFolder,"/"+name);
+        if(!dest.exists()) return;
+        Runtime r = read(name);
+        String libFolder = "lib";
+        if(new File(dest,libFolder+"/"+r.arch).exists()) libFolder = libFolder+"/"+r.arch;
+        File ftIn = new File(dest, libFolder+ "/libfreetype.so.6");
+        File ftOut = new File(dest, libFolder + "/libfreetype.so");
+        if (ftIn.exists() && (!ftOut.exists() || ftIn.length() != ftOut.length())) {
+            ftIn.renameTo(ftOut);
+        }
+
+        // Refresh libraries
+        copyDummyNativeLib(ctx,"libawt_xawt.so",libFolder);
+    }
+    private static void copyDummyNativeLib(Context ctx, String name, String libFolder) throws IOException {
+
+        File fileLib = new File(MultiRTUtils.runtimeFolder, name+"/"+libFolder + "/" + name);
+        fileLib.delete();
+        FileInputStream is = new FileInputStream(new File(ctx.getApplicationInfo().nativeLibraryDir, name));
+        FileOutputStream os = new FileOutputStream(fileLib);
+        IOUtils.copy(is, os);
+        is.close();
+        os.close();
+    }
+    public static Runtime installRuntimeNamedBinpack(InputStream universalFileInputStream, InputStream platformBinsInputStream, String name, String binpackVersion, ProgressReporterThingy thingy) throws IOException {
+        File dest = new File(runtimeFolder,"/"+name);
+        if(dest.exists()) FileUtils.deleteDirectory(dest);
+        dest.mkdirs();
+        __installRuntimeNamed__NoRM(universalFileInputStream,dest,thingy);
+        __installRuntimeNamed__NoRM(platformBinsInputStream,dest,thingy);
+        File binpack_verfile = new File(runtimeFolder,"/"+name+"/pojav_version");
+        FileOutputStream fos = new FileOutputStream(binpack_verfile);
+        fos.write(binpackVersion.getBytes());
+        fos.close();
+        cache.remove(name); // Force reread
+        return read(name);
+    }
+    public static String __internal__readBinpackVersion(String name) {
+        File binpack_verfile = new File(runtimeFolder,"/"+name+"/pojav_version");
+        try {
+            if (binpack_verfile.exists()) {
+                return Tools.read(binpack_verfile.getAbsolutePath());
+            }else{
+                return null;
+            }
+        }catch (IOException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
     public static void removeRuntimeNamed(String name) throws IOException {
         File dest = new File(runtimeFolder,"/"+name);
         if(dest.exists()) {
@@ -68,18 +134,27 @@ public class MultiRTUtils {
             cache.remove(name);
         }
     }
+    public static boolean setRuntimeNamed(Context ctx, String name) throws IOException {
+        File dest = new File(runtimeFolder,"/"+name);
+        if(!dest.exists()) return false;
+        Tools.DIR_HOME_JRE = dest.getAbsolutePath();
+        JREUtils.relocateLibPath(ctx);
+        return true;
+    }
     private static Runtime read(String name) {
         if(cache.containsKey(name)) return cache.get(name);
         Runtime retur;
         File release = new File(runtimeFolder,"/"+name+"/release");
         if(!release.exists()) {
-            return null;
+            return new Runtime(name);
         }
         try {
             String content = Tools.read(release.getAbsolutePath());
             int _JAVA_VERSION_index = content.indexOf(JAVA_VERSION_str);
-            if(_JAVA_VERSION_index != -1) {
+            int _OS_ARCH_index = content.indexOf(OS_ARCH_str);
+            if(_JAVA_VERSION_index != -1 && _OS_ARCH_index != -1) {
                 _JAVA_VERSION_index += JAVA_VERSION_str.length();
+                _OS_ARCH_index += OS_ARCH_str.length();
                 String javaVersion = content.substring(_JAVA_VERSION_index,content.indexOf('"',_JAVA_VERSION_index));
                     String[] javaVersionSplit = javaVersion.split("\\.");
                     int javaVersionInt;
@@ -89,6 +164,7 @@ public class MultiRTUtils {
                         javaVersionInt = Integer.parseInt(javaVersionSplit[0]);
                     }
                     Runtime r = new Runtime(name);
+                    r.arch = content.substring(_OS_ARCH_index,content.indexOf('"',_OS_ARCH_index));
                     r.javaVersion = javaVersionInt;
                     r.versionString = javaVersion;
                     retur = r;

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/multirt/RTRecyclerViewAdapter.java

@@ -7,6 +7,7 @@ import android.graphics.Color;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Button;
 import android.widget.ImageView;
 import android.widget.TextView;
 
@@ -15,6 +16,7 @@ import androidx.recyclerview.widget.RecyclerView;
 
 import net.kdt.pojavlaunch.R;
 import net.kdt.pojavlaunch.Tools;
+import net.kdt.pojavlaunch.prefs.LauncherPreferences;
 
 import java.io.IOException;
 import java.util.List;
@@ -34,9 +36,11 @@ public class RTRecyclerViewAdapter extends RecyclerView.Adapter {
     @Override
     public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
         final List<MultiRTUtils.Runtime> runtimes = MultiRTUtils.getRuntimes();
-        ((RTViewHolder)holder).bindRuntime(runtimes.get(position));
+        ((RTViewHolder)holder).bindRuntime(runtimes.get(position),position);
+    }
+    public boolean isDefaultRuntime(MultiRTUtils.Runtime rt) {
+        return LauncherPreferences.PREF_DEFAULT_RUNTIME.equals(rt.name);
     }
-
     @Override
     public int getItemCount() {
         return MultiRTUtils.getRuntimes().size();
@@ -45,32 +49,42 @@ public class RTRecyclerViewAdapter extends RecyclerView.Adapter {
         final TextView javaVersionView;
         final TextView fullJavaVersionView;
         final ColorStateList defaultColors;
+        final Button setDefaultButton;
         final Context ctx;
         MultiRTUtils.Runtime currentRuntime;
+        int currentPosition;
         public RTViewHolder(View itemView) {
             super(itemView);
             javaVersionView = itemView.findViewById(R.id.multirt_view_java_version);
             fullJavaVersionView = itemView.findViewById(R.id.multirt_view_java_version_full);
             itemView.findViewById(R.id.multirt_view_removebtn).setOnClickListener(this);
+            setDefaultButton = itemView.findViewById(R.id.multirt_view_setdefaultbtn);
+            setDefaultButton.setOnClickListener(this);
             defaultColors =  fullJavaVersionView.getTextColors();
             ctx = itemView.getContext();
         }
-        public void bindRuntime(MultiRTUtils.Runtime rt) {
+        public void bindRuntime(MultiRTUtils.Runtime rt, int pos) {
             currentRuntime = rt;
+            currentPosition = pos;
             if(rt.versionString != null) {
                 javaVersionView.setText(ctx.getString(R.string.multirt_java_ver, rt.name, rt.javaVersion));
                 fullJavaVersionView.setText(rt.versionString);
                 fullJavaVersionView.setTextColor(defaultColors);
-
+                setDefaultButton.setVisibility(View.VISIBLE);
+                boolean default_ = isDefaultRuntime(rt);
+                setDefaultButton.setEnabled(!default_);
+                setDefaultButton.setText(default_?R.string.multirt_config_setdefault_already:R.string.multirt_config_setdefault);
             }else{
                 javaVersionView.setText(rt.name);
                 fullJavaVersionView.setText(R.string.multirt_runtime_corrupt);
                 fullJavaVersionView.setTextColor(Color.RED);
+                setDefaultButton.setVisibility(View.GONE);
             }
         }
 
         @Override
         public void onClick(View v) {
+            if(v.getId() == R.id.multirt_view_removebtn) {
                 if (currentRuntime != null) {
                     final ProgressDialog barrier = new ProgressDialog(ctx);
                     barrier.setMessage(ctx.getString(R.string.global_waiting));
@@ -85,12 +99,19 @@ public class RTRecyclerViewAdapter extends RecyclerView.Adapter {
                         }
                         v.post(() -> {
                             barrier.dismiss();
-                            RTRecyclerViewAdapter.this.notifyDataSetChanged();
+                            RTRecyclerViewAdapter.this.notifyItemRemoved(currentPosition);
                             dialog.dialog.show();
                         });
                     });
                     t.start();
                 }
+            }else if(v.getId() == R.id.multirt_view_setdefaultbtn) {
+                if(currentRuntime != null) {
+                    LauncherPreferences.PREF_DEFAULT_RUNTIME = currentRuntime.name;
+                    LauncherPreferences.DEFAULT_PREF.edit().putString("defaultRuntime",LauncherPreferences.PREF_DEFAULT_RUNTIME).apply();
+                    RTRecyclerViewAdapter.this.notifyDataSetChanged();
+                }
+            }
         }
     }
 }

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/prefs/LauncherPreferences.java

@@ -2,6 +2,7 @@ package net.kdt.pojavlaunch.prefs;
 
 import android.content.*;
 import net.kdt.pojavlaunch.*;
+import net.kdt.pojavlaunch.multirt.MultiRTUtils;
 
 public class LauncherPreferences
 {
@@ -29,6 +30,7 @@ public class LauncherPreferences
     public static boolean PREF_DISABLE_GESTURES = false;
     public static float PREF_MOUSESPEED = 1f;
     public static int PREF_RAM_ALLOCATION=300;
+    public static String PREF_DEFAULT_RUNTIME;
     public static void loadPreferences() {
         PREF_RENDERER = DEFAULT_PREF.getString("renderer", "opengles2");
         PREF_BUTTONSIZE = DEFAULT_PREF.getInt("buttonscale", 100);
@@ -108,5 +110,11 @@ public class LauncherPreferences
                     PREF_CUSTOM_JAVA_ARGS.replace(arg, "")).commit();
             }
         }
+        if(DEFAULT_PREF.contains("defaultRuntime")) {
+            PREF_DEFAULT_RUNTIME = DEFAULT_PREF.getString("defaultRuntime","");
+        }else{
+            PREF_DEFAULT_RUNTIME = MultiRTUtils.getRuntimes().get(0).name;
+            LauncherPreferences.DEFAULT_PREF.edit().putString("defaultRuntime",LauncherPreferences.PREF_DEFAULT_RUNTIME).apply();
+        }
     }
 }

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/prefs/UninstallJREDialogPreference.java

@@ -1,53 +0,0 @@
-package net.kdt.pojavlaunch.prefs;
-
-import android.content.*;
-import androidx.appcompat.app.*;
-import androidx.preference.*;
-import android.util.*;
-import android.widget.*;
-import java.io.*;
-import net.kdt.pojavlaunch.*;
-
-import net.kdt.pojavlaunch.R;
-import org.apache.commons.io.*;
-
-public class UninstallJREDialogPreference extends Preference implements DialogInterface.OnClickListener
-{
-    private AlertDialog mDialog;
-    public UninstallJREDialogPreference(Context ctx) {
-        this(ctx, null);
-    }
-    
-    public UninstallJREDialogPreference(Context ctx, AttributeSet attrs) {
-        super(ctx, attrs);
-        setPersistent(false);
-        
-        AlertDialog.Builder dialog = new AlertDialog.Builder(getContext());
-        dialog.setMessage(R.string.mcl_setting_title_uninstalljre);
-        dialog.setPositiveButton(android.R.string.ok, this);
-        dialog.setNegativeButton(android.R.string.cancel, this);
-        mDialog = dialog.create();
-    }
-
-    @Override
-    protected void onClick() {
-        super.onClick();
-        mDialog.show();
-    }
-    
-    @Override
-    public void onClick(DialogInterface dialog, int which) {
-        if (which == DialogInterface.BUTTON_POSITIVE) {
-            try {
-                FileUtils.deleteDirectory(new File(Tools.DIR_HOME_JRE));
-                
-                getContext().getSharedPreferences("pojav_extract", Context.MODE_PRIVATE)
-                    .edit().putBoolean(PojavLoginActivity.PREF_IS_INSTALLED_JAVARUNTIME, false).commit();
-
-                Toast.makeText(getContext(), R.string.toast_uninstalljre_done, Toast.LENGTH_SHORT).show();
-            } catch (IOException e) {
-                Tools.showError(getContext(), e);
-            }
-        }
-    }
-}

app_pojavlauncher/src/main/java/net/kdt/pojavlaunch/utils/JREUtils.java

@@ -168,7 +168,7 @@ public class JREUtils
         Log.i("jrelog-logcat","Logcat thread started");
     }
     
-    public static void relocateLibPath(final Context ctx) throws Exception {
+    public static void relocateLibPath(final Context ctx) throws IOException {
         if (JRE_ARCHITECTURE == null) {
             JRE_ARCHITECTURE = readJREReleaseProperties().get("OS_ARCH");
             if (JRE_ARCHITECTURE.startsWith("i") && JRE_ARCHITECTURE.endsWith("86") && Tools.CURRENT_ARCHITECTURE.contains("x86") && !Tools.CURRENT_ARCHITECTURE.contains("64")) {

app_pojavlauncher/src/main/res/layout/multirt_recyclable_view.xml

@@ -39,4 +39,14 @@
         app:layout_constraintTop_toTopOf="@+id/multirt_view_java_version"
         app:srcCompat="@drawable/ic_remove" />
 
+    <Button
+        android:id="@+id/multirt_view_setdefaultbtn"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="8dp"
+        android:text="@string/multirt_config_setdefault"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toStartOf="@+id/multirt_view_removebtn"
+        app:layout_constraintTop_toTopOf="@+id/multirt_view_removebtn" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>

app_pojavlauncher/src/main/res/values/strings.xml

@@ -219,4 +219,6 @@
     <string name="multirt_title">Runtime Manager</string>
     <string name="multirt_subtitle">Manage installed Java VMs</string>
     <string name="multirt_progress_caching">Caching...</string>
+    <string name="multirt_config_setdefault">Set default</string>
+    <string name="multirt_config_setdefault_already">Default</string>
 </resources>

app_pojavlauncher/src/main/res/xml/pref_main.xml

@@ -6,10 +6,6 @@
     <androidx.preference.PreferenceCategory
 		android:title="@string/mcl_setting_category_general">
 
-        <net.kdt.pojavlaunch.prefs.UninstallJREDialogPreference
-            android:summary="@string/mcl_setting_subtitle_uninstalljre"
-            android:title="@string/mcl_setting_title_uninstalljre"
-            app2:icon="@drawable/rm_jre" />
         <net.kdt.pojavlaunch.prefs.RuntimeManagerPreference
             android:summary="@string/multirt_subtitle"
             android:title="@string/multirt_title"/>