Request write external storage permission

app/src/full/java/com/topjohnwu/magisk/asyncs/InstallMagisk.java

@@ -1,5 +1,6 @@
 package com.topjohnwu.magisk.asyncs;
 
+import android.Manifest;
 import android.app.Activity;
 import android.app.ProgressDialog;
 import android.net.Uri;
@@ -14,6 +15,7 @@ import com.topjohnwu.magisk.Data;
 import com.topjohnwu.magisk.FlashActivity;
 import com.topjohnwu.magisk.MagiskManager;
 import com.topjohnwu.magisk.R;
+import com.topjohnwu.magisk.components.BaseActivity;
 import com.topjohnwu.magisk.container.TarEntry;
 import com.topjohnwu.magisk.utils.Download;
 import com.topjohnwu.magisk.utils.Utils;
@@ -76,6 +78,11 @@ public class InstallMagisk extends ParallelTask<Void, Void, Boolean> {
         bootUri = boot;
     }
 
+    @Override
+    protected BaseActivity getActivity() {
+        return (BaseActivity) super.getActivity();
+    }
+
     @Override
     protected void onPreExecute() {
         if (mode == FIX_ENV_MODE) {
@@ -382,4 +389,10 @@ public class InstallMagisk extends ParallelTask<Void, Void, Boolean> {
             activity.buttonPanel.setVisibility(View.VISIBLE);
         }
     }
+
+    @Override
+    public void exec(Void... voids) {
+        getActivity().runWithPermission(
+                new String[] {Manifest.permission.WRITE_EXTERNAL_STORAGE}, super::exec);
+    }
 }

app/src/full/java/com/topjohnwu/magisk/asyncs/ParallelTask.java

@@ -9,8 +9,6 @@ public abstract class ParallelTask<Params, Progress, Result> extends AsyncTask<P
 
     private WeakReference<Activity> weakActivity;
 
-    private Runnable callback = null;
-
     public ParallelTask() {}
 
     public ParallelTask(Activity context) {
@@ -22,18 +20,7 @@ public abstract class ParallelTask<Params, Progress, Result> extends AsyncTask<P
     }
 
     @SuppressWarnings("unchecked")
-    public ParallelTask<Params, Progress, Result> exec(Params... params) {
+    public void exec(Params... params) {
         executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, params);
-        return this;
-    }
-
-    @Override
-    protected void onPostExecute(Result result) {
-        if (callback != null) callback.run();
-    }
-
-    public ParallelTask<Params, Progress, Result> setCallBack(Runnable next) {
-        callback = next;
-        return this;
     }
 }

app/src/full/java/com/topjohnwu/magisk/asyncs/ProcessRepoZip.java

@@ -154,11 +154,9 @@ public class ProcessRepoZip extends ParallelTask<Void, Object, Boolean> {
     }
 
     @Override
-    public ParallelTask<Void, Object, Boolean> exec(Void... voids) {
+    public void exec(Void... voids) {
         getActivity().runWithPermission(
-                new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE },
+                new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE }, super::exec);
-                () -> super.exec(voids));
-        return this;
     }
 
     private class ProgressInputStream extends FilterInputStream {