260 lines
8.9 KiB
Java
Executable File
260 lines
8.9 KiB
Java
Executable File
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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package org.chromium.ui;
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import android.app.Activity;
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import android.content.ActivityNotFoundException;
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import android.content.ContentResolver;
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import android.content.Context;
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import android.content.Intent;
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import android.graphics.Bitmap;
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import android.graphics.Rect;
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import android.os.Bundle;
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import android.util.Log;
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import android.util.SparseArray;
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import android.view.View;
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import android.widget.Toast;
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import java.io.ByteArrayOutputStream;
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import java.util.HashMap;
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import org.chromium.base.CalledByNative;
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import org.chromium.base.JNINamespace;
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/**
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* The window base class that has the minimum functionality.
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*/
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@JNINamespace("ui")
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public class WindowAndroid {
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private static final String TAG = "WindowAndroid";
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// Native pointer to the c++ WindowAndroid object.
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private int mNativeWindowAndroid = 0;
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// Constants used for intent request code bounding.
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private static final int REQUEST_CODE_PREFIX = 1000;
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private static final int REQUEST_CODE_RANGE_SIZE = 100;
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// A string used as a key to store intent errors in a bundle
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static final String WINDOW_CALLBACK_ERRORS = "window_callback_errors";
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private int mNextRequestCode = 0;
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protected Activity mActivity;
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protected Context mApplicationContext;
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protected SparseArray<IntentCallback> mOutstandingIntents;
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protected HashMap<Integer, String> mIntentErrors;
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/**
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* @param activity
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*/
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public WindowAndroid(Activity activity) {
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mActivity = activity;
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mApplicationContext = mActivity.getApplicationContext();
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mOutstandingIntents = new SparseArray<IntentCallback>();
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mIntentErrors = new HashMap<Integer, String>();
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}
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/**
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* Shows an intent and returns the results to the callback object.
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* @param intent The intent that needs to be showed.
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* @param callback The object that will receive the results for the intent.
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* @param errorId The ID of error string to be show if activity is paused before intent
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* results.
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* @return Whether the intent was shown.
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*/
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public boolean showIntent(Intent intent, IntentCallback callback, int errorId) {
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int requestCode = REQUEST_CODE_PREFIX + mNextRequestCode;
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mNextRequestCode = (mNextRequestCode + 1) % REQUEST_CODE_RANGE_SIZE;
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try {
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mActivity.startActivityForResult(intent, requestCode);
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} catch (ActivityNotFoundException e) {
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return false;
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}
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mOutstandingIntents.put(requestCode, callback);
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mIntentErrors.put(requestCode, mActivity.getString(errorId));
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return true;
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}
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/**
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* Displays an error message with a provided error message string.
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* @param error The error message string to be displayed.
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*/
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public void showError(String error) {
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if (error != null) {
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Toast.makeText(mActivity, error, Toast.LENGTH_SHORT).show();
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}
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}
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/**
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* Displays an error message from the given resource id.
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* @param resId The error message string's resource id.
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*/
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public void showError(int resId) {
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showError(mActivity.getString(resId));
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}
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/**
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* Displays an error message for a nonexistent callback.
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* @param error The error message string to be displayed.
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*/
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protected void showCallbackNonExistentError(String error) {
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showError(error);
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}
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/**
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* Broadcasts the given intent to all interested BroadcastReceivers.
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*/
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public void sendBroadcast(Intent intent) {
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mActivity.sendBroadcast(intent);
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}
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/**
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* TODO(nileshagrawal): Stop returning Activity Context crbug.com/233440.
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* @return Activity context.
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* @see #getApplicationContext()
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*/
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@Deprecated
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public Context getContext() {
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return mActivity;
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}
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/**
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* @return The application context for this activity.
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*/
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public Context getApplicationContext() {
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return mApplicationContext;
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}
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/**
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* Saves the error messages that should be shown if any pending intents would return
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* after the application has been put onPause.
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* @param bundle The bundle to save the information in onPause
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*/
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public void saveInstanceState(Bundle bundle) {
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bundle.putSerializable(WINDOW_CALLBACK_ERRORS, mIntentErrors);
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}
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/**
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* Restores the error messages that should be shown if any pending intents would return
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* after the application has been put onPause.
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* @param bundle The bundle to restore the information from onResume
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*/
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public void restoreInstanceState(Bundle bundle) {
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if (bundle == null) return;
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Object errors = bundle.getSerializable(WINDOW_CALLBACK_ERRORS);
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if (errors instanceof HashMap) {
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@SuppressWarnings("unchecked")
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HashMap<Integer, String> intentErrors = (HashMap<Integer, String>) errors;
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mIntentErrors = intentErrors;
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}
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}
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/**
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* Responds to the intent result if the intent was created by the native window.
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* @param requestCode Request code of the requested intent.
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* @param resultCode Result code of the requested intent.
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* @param data The data returned by the intent.
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* @return Boolean value of whether the intent was started by the native window.
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*/
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public boolean onActivityResult(int requestCode, int resultCode, Intent data) {
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IntentCallback callback = mOutstandingIntents.get(requestCode);
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mOutstandingIntents.delete(requestCode);
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String errorMessage = mIntentErrors.remove(requestCode);
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if (callback != null) {
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callback.onIntentCompleted(this, resultCode,
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mActivity.getContentResolver(), data);
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return true;
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} else {
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if (errorMessage != null) {
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showCallbackNonExistentError(errorMessage);
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return true;
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}
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}
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return false;
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}
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/**
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* An interface that intent callback objects have to implement.
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*/
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public interface IntentCallback {
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/**
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* Handles the data returned by the requested intent.
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* @param window A window reference.
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* @param resultCode Result code of the requested intent.
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* @param contentResolver An instance of ContentResolver class for accessing returned data.
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* @param data The data returned by the intent.
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*/
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public void onIntentCompleted(WindowAndroid window, int resultCode,
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ContentResolver contentResolver, Intent data);
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}
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/**
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* Destroys the c++ WindowAndroid object if one has been created.
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*/
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public void destroy() {
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if (mNativeWindowAndroid != 0) {
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nativeDestroy(mNativeWindowAndroid);
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mNativeWindowAndroid = 0;
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}
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}
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/**
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* Returns a pointer to the c++ AndroidWindow object and calls the initializer if
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* the object has not been previously initialized.
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* @return A pointer to the c++ AndroidWindow.
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*/
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public int getNativePointer() {
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if (mNativeWindowAndroid == 0) {
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mNativeWindowAndroid = nativeInit();
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}
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return mNativeWindowAndroid;
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}
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/**
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* Returns a PNG-encoded screenshot of the the window region at (|windowX|,
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* |windowY|) with the size |width| by |height| pixels.
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*/
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@CalledByNative
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public byte[] grabSnapshot(int windowX, int windowY, int width, int height) {
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try {
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// Take a screenshot of the content view. This generally includes UI
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// controls such as the URL bar.
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View contentView = mActivity.findViewById(android.R.id.content);
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if (contentView == null) return null;
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Bitmap bitmap =
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UiUtils.generateScaledScreenshot(contentView, 0, Bitmap.Config.ARGB_8888);
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if (bitmap == null) return null;
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// Clip the result into the requested region.
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if (windowX > 0 || windowY > 0 || width != bitmap.getWidth() ||
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height != bitmap.getHeight()) {
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Rect clip = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
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clip.intersect(windowX, windowY, windowX + width, windowY + height);
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bitmap = Bitmap.createBitmap(
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bitmap, clip.left, clip.top, clip.width(), clip.height());
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}
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// Compress the result into a PNG.
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ByteArrayOutputStream result = new ByteArrayOutputStream();
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if (!bitmap.compress(Bitmap.CompressFormat.PNG, 100, result)) return null;
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bitmap.recycle();
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return result.toByteArray();
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} catch (OutOfMemoryError e) {
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Log.e(TAG, "Out of memory while grabbing window snapshot.", e);
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return null;
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}
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}
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private native int nativeInit();
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private native void nativeDestroy(int nativeWindowAndroid);
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}
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