Use scoped app storage on Android (#11466)

From November 2021, the Play Store will no longer be accepting
apps which use the deprecated getExternalStorageDirectory() API.

Therefore, this commit replaces uses of deprecated API with the new
scoped API (`getExternalFilesDir()` and `getExternalCacheDir()`).
It also provides a temporary migration to move user data from the
shared external directory to new storage.

Fixes #2097,  #11417 and #11118

.clang-format

@@ -1,6 +1,7 @@
 BasedOnStyle: LLVM
-IndentWidth: 8
+IndentWidth: 4
 UseTab: Always
+TabWidth: 4
 BreakBeforeBraces: Custom
 Standard: Cpp11
 BraceWrapping:
@@ -16,7 +17,7 @@ BraceWrapping:
 FixNamespaceComments: false
 AllowShortIfStatementsOnASingleLine: false
 IndentCaseLabels: false
-AccessModifierOffset: -8
+AccessModifierOffset: -4
 ColumnLimit: 90
 AllowShortFunctionsOnASingleLine: InlineOnly
 SortIncludes: false
@@ -26,7 +27,7 @@ IncludeCategories:
   - Regex:           '^<.*'
     Priority:        1
 AlignAfterOpenBracket: DontAlign
-ContinuationIndentWidth: 16
-ConstructorInitializerIndentWidth: 16
+ContinuationIndentWidth: 8
+ConstructorInitializerIndentWidth: 8
 BreakConstructorInitializers: AfterColon
 AlwaysBreakTemplateDeclarations: Yes

android/app/src/main/java/net/minetest/minetest/GameActivity.java

@@ -171,4 +171,12 @@ public void openURI(String uri) {
 		Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
 		startActivity(browserIntent);
 	}
+
+	public String getUserDataPath() {
+		return Utils.getUserDataDirectory(this).getAbsolutePath();
+	}
+
+	public String getCachePath() {
+		return Utils.getCacheDirectory(this).getAbsolutePath();
+	}
 }

android/app/src/main/java/net/minetest/minetest/MainActivity.java

@@ -29,12 +29,14 @@
 import android.content.pm.PackageManager;
 import android.os.Build;
 import android.os.Bundle;
+import android.os.Environment;
 import android.view.View;
 import android.widget.ProgressBar;
 import android.widget.TextView;
 import android.widget.Toast;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.StringRes;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.core.app.ActivityCompat;
 import androidx.core.content.ContextCompat;
@@ -43,11 +45,7 @@
 import java.util.Arrays;
 import java.util.List;
 
-import static net.minetest.minetest.UnzipService.ACTION_FAILURE;
-import static net.minetest.minetest.UnzipService.ACTION_PROGRESS;
-import static net.minetest.minetest.UnzipService.ACTION_UPDATE;
-import static net.minetest.minetest.UnzipService.FAILURE;
-import static net.minetest.minetest.UnzipService.SUCCESS;
+import static net.minetest.minetest.UnzipService.*;
 
 public class MainActivity extends AppCompatActivity {
 	private final static int versionCode = BuildConfig.VERSION_CODE;
@@ -56,26 +54,40 @@ public class MainActivity extends AppCompatActivity {
 			new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE};
 	private static final String SETTINGS = "MinetestSettings";
 	private static final String TAG_VERSION_CODE = "versionCode";
+
 	private ProgressBar mProgressBar;
 	private TextView mTextView;
 	private SharedPreferences sharedPreferences;
+
 	private final BroadcastReceiver myReceiver = new BroadcastReceiver() {
 		@Override
 		public void onReceive(Context context, Intent intent) {
 			int progress = 0;
-			if (intent != null)
+			@StringRes int message = 0;
+			if (intent != null) {
 				progress = intent.getIntExtra(ACTION_PROGRESS, 0);
-			if (progress >= 0) {
+				message = intent.getIntExtra(ACTION_PROGRESS_MESSAGE, 0);
+			}
+
+			if (progress == FAILURE) {
+				Toast.makeText(MainActivity.this, intent.getStringExtra(ACTION_FAILURE), Toast.LENGTH_LONG).show();
+				finish();
+			} else if (progress == SUCCESS) {
+				startNative();
+			} else {
 				if (mProgressBar != null) {
 					mProgressBar.setVisibility(View.VISIBLE);
-					mProgressBar.setProgress(progress);
+					if (progress == INDETERMINATE) {
+						mProgressBar.setIndeterminate(true);
+					} else {
+						mProgressBar.setIndeterminate(false);
+						mProgressBar.setProgress(progress);
+					}
 				}
 				mTextView.setVisibility(View.VISIBLE);
-			} else if (progress == FAILURE) {
-				Toast.makeText(MainActivity.this, intent.getStringExtra(ACTION_FAILURE), Toast.LENGTH_LONG).show();
-				finish();
-			} else if (progress == SUCCESS)
-				startNative();
+				if (message != 0)
+					mTextView.setText(message);
+			}
 		}
 	};
 
@@ -88,6 +100,7 @@ public void onCreate(Bundle savedInstanceState) {
 		mProgressBar = findViewById(R.id.progressBar);
 		mTextView = findViewById(R.id.textView);
 		sharedPreferences = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
+
 		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
 			checkPermission();
 		else
@@ -120,17 +133,35 @@ public void onRequestPermissionsResult(int requestCode,
 				if (grantResult != PackageManager.PERMISSION_GRANTED) {
 					Toast.makeText(this, R.string.not_granted, Toast.LENGTH_LONG).show();
 					finish();
+					return;
 				}
 			}
 			checkAppVersion();
 		}
 	}
 
 	private void checkAppVersion() {
-		if (sharedPreferences.getInt(TAG_VERSION_CODE, 0) == versionCode)
+		if (!Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
+			Toast.makeText(this, R.string.no_external_storage, Toast.LENGTH_LONG).show();
+			finish();
+			return;
+		}
+
+		if (UnzipService.getIsRunning()) {
+			mProgressBar.setVisibility(View.VISIBLE);
+			mProgressBar.setIndeterminate(true);
+			mTextView.setVisibility(View.VISIBLE);
+		} else if (sharedPreferences.getInt(TAG_VERSION_CODE, 0) == versionCode &&
+				Utils.isInstallValid(this)) {
 			startNative();
-		else
-			new CopyZipTask(this).execute(getCacheDir() + "/Minetest.zip");
+		} else {
+			mProgressBar.setVisibility(View.VISIBLE);
+			mProgressBar.setIndeterminate(true);
+			mTextView.setVisibility(View.VISIBLE);
+
+			Intent intent = new Intent(this, UnzipService.class);
+			startService(intent);
+		}
 	}
 
 	private void startNative() {