Java tutorial
/* * Copyright (C) 2006 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.android.browser; import android.app.Activity; import android.app.AlertDialog; import android.app.KeyguardManager; import android.content.Context; import android.content.Intent; import android.content.pm.PackageManager; import android.content.res.Configuration; import android.os.Bundle; import android.os.PowerManager; import android.support.v4.app.ActivityCompat; import android.util.Log; import android.view.ActionMode; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.KeyEvent; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.view.Window; import com.android.browser.stub.NullController; import com.google.common.annotations.VisibleForTesting; public class BrowserActivity extends Activity implements ActivityCompat.OnRequestPermissionsResultCallback { public static final String ACTION_SHOW_BOOKMARKS = "show_bookmarks"; public static final String ACTION_SHOW_BROWSER = "show_browser"; public static final String ACTION_RESTART = "--restart--"; private static final String EXTRA_STATE = "state"; public static final String EXTRA_DISABLE_URL_OVERRIDE = "disable_url_override"; private final static String LOGTAG = "browser"; private final static boolean LOGV_ENABLED = Browser.LOGV_ENABLED; private ActivityController mController = NullController.INSTANCE; public static final int PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE = 1; @Override public void onCreate(Bundle icicle) { if (LOGV_ENABLED) { Log.v(LOGTAG, this + " onStart, has state: " + (icicle == null ? "false" : "true")); } super.onCreate(icicle); if (shouldIgnoreIntents()) { finish(); return; } // If this was a web search request, pass it on to the default web // search provider and finish this activity. if (IntentHandler.handleWebSearchIntent(this, null, getIntent())) { finish(); return; } mController = createController(); Intent intent = (icicle == null) ? getIntent() : null; mController.start(intent); } public static boolean isTablet(Context context) { return context.getResources().getBoolean(R.bool.isTablet); } private Controller createController() { Controller controller = new Controller(this); boolean xlarge = isTablet(this); UI ui = null; if (xlarge) { ui = new XLargeUi(this, controller); } else { ui = new PhoneUi(this, controller); } controller.setUi(ui); return controller; } @VisibleForTesting Controller getController() { return (Controller) mController; } @Override protected void onNewIntent(Intent intent) { if (shouldIgnoreIntents()) return; if (ACTION_RESTART.equals(intent.getAction())) { Bundle outState = new Bundle(); mController.onSaveInstanceState(outState); finish(); getApplicationContext().startActivity(new Intent(getApplicationContext(), BrowserActivity.class) .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK).putExtra(EXTRA_STATE, outState)); return; } mController.handleNewIntent(intent); } private KeyguardManager mKeyguardManager; private PowerManager mPowerManager; private boolean shouldIgnoreIntents() { // Only process intents if the screen is on and the device is unlocked // aka, if we will be user-visible if (mKeyguardManager == null) { mKeyguardManager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE); } if (mPowerManager == null) { mPowerManager = (PowerManager) getSystemService(Context.POWER_SERVICE); } boolean ignore = !mPowerManager.isScreenOn(); ignore |= mKeyguardManager.inKeyguardRestrictedInputMode(); if (LOGV_ENABLED) { Log.v(LOGTAG, "ignore intents: " + ignore); } return ignore; } @Override protected void onResume() { super.onResume(); if (LOGV_ENABLED) { Log.v(LOGTAG, "BrowserActivity.onResume: this=" + this); } mController.onResume(); } @Override public boolean onMenuOpened(int featureId, Menu menu) { if (Window.FEATURE_OPTIONS_PANEL == featureId) { mController.onMenuOpened(featureId, menu); } return true; } @Override public void onOptionsMenuClosed(Menu menu) { mController.onOptionsMenuClosed(menu); } @Override public void onContextMenuClosed(Menu menu) { super.onContextMenuClosed(menu); mController.onContextMenuClosed(menu); } /** * onSaveInstanceState(Bundle map) * onSaveInstanceState is called right before onStop(). The map contains * the saved state. */ @Override protected void onSaveInstanceState(Bundle outState) { if (LOGV_ENABLED) { Log.v(LOGTAG, "BrowserActivity.onSaveInstanceState: this=" + this); } mController.onSaveInstanceState(outState); } @Override protected void onPause() { mController.onPause(); super.onPause(); } @Override protected void onDestroy() { if (LOGV_ENABLED) { Log.v(LOGTAG, "BrowserActivity.onDestroy: this=" + this); } super.onDestroy(); mController.onDestroy(); mController = NullController.INSTANCE; } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); mController.onConfgurationChanged(newConfig); } @Override public void onLowMemory() { super.onLowMemory(); mController.onLowMemory(); } @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); return mController.onCreateOptionsMenu(menu); } @Override public boolean onPrepareOptionsMenu(Menu menu) { super.onPrepareOptionsMenu(menu); return mController.onPrepareOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { if (!mController.onOptionsItemSelected(item)) { return super.onOptionsItemSelected(item); } return true; } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { mController.onCreateContextMenu(menu, v, menuInfo); } @Override public boolean onContextItemSelected(MenuItem item) { return mController.onContextItemSelected(item); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { return mController.onKeyDown(keyCode, event) || super.onKeyDown(keyCode, event); } @Override public boolean onKeyLongPress(int keyCode, KeyEvent event) { return mController.onKeyLongPress(keyCode, event) || super.onKeyLongPress(keyCode, event); } @Override public boolean onKeyUp(int keyCode, KeyEvent event) { return mController.onKeyUp(keyCode, event) || super.onKeyUp(keyCode, event); } @Override public void onActionModeStarted(ActionMode mode) { super.onActionModeStarted(mode); mController.onActionModeStarted(mode); } @Override public void onActionModeFinished(ActionMode mode) { super.onActionModeFinished(mode); mController.onActionModeFinished(mode); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent intent) { mController.onActivityResult(requestCode, resultCode, intent); } @Override public boolean onSearchRequested() { return mController.onSearchRequested(); } @Override public boolean dispatchKeyEvent(KeyEvent event) { return mController.dispatchKeyEvent(event) || super.dispatchKeyEvent(event); } @Override public boolean dispatchKeyShortcutEvent(KeyEvent event) { return mController.dispatchKeyShortcutEvent(event) || super.dispatchKeyShortcutEvent(event); } @Override public boolean dispatchTouchEvent(MotionEvent ev) { return mController.dispatchTouchEvent(ev) || super.dispatchTouchEvent(ev); } @Override public boolean dispatchTrackballEvent(MotionEvent ev) { return mController.dispatchTrackballEvent(ev) || super.dispatchTrackballEvent(ev); } @Override public boolean dispatchGenericMotionEvent(MotionEvent ev) { return mController.dispatchGenericMotionEvent(ev) || super.dispatchGenericMotionEvent(ev); } @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { switch (requestCode) { case PERMISSIONS_REQUEST_WRITE_EXTERNAL_STORAGE: // If request is cancelled, the result array is empty if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) { DownloadHandler.checkPendingDownloads(this); } else { new AlertDialog.Builder(this).setTitle(R.string.permission_not_granted_dialog_title) .setMessage(R.string.permission_not_granted_dialog_message) .setPositiveButton(android.R.string.ok, null).show(); } break; } } }