| /* |
| * Copyright (C) 2015 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 android.theme.app; |
| |
| import android.graphics.Bitmap; |
| import android.graphics.Bitmap.CompressFormat; |
| import android.graphics.Canvas; |
| import android.os.AsyncTask; |
| import android.os.Environment; |
| import android.util.Log; |
| import android.view.View; |
| |
| import java.io.File; |
| import java.io.FileOutputStream; |
| |
| /** |
| * A task which gets the UI element to render to a bitmap and then saves that |
| * as a PNG asynchronously. |
| */ |
| class GenerateBitmapTask extends AsyncTask<Void, Void, Boolean> { |
| private static final String TAG = "GenerateBitmapTask"; |
| |
| private final View mView; |
| private final File mOutDir; |
| |
| private Bitmap mBitmap; |
| |
| protected final String mName; |
| |
| public GenerateBitmapTask(View view, File outDir, String name) { |
| mView = view; |
| mOutDir = outDir; |
| mName = name; |
| } |
| |
| @Override |
| protected void onPreExecute() { |
| if (mView.getWidth() == 0 || mView.getHeight() == 0) { |
| Log.e(TAG, "Unable to draw view due to incorrect size: " + mName); |
| return; |
| } |
| |
| mBitmap = Bitmap.createBitmap(mView.getWidth(), mView.getHeight(), |
| Bitmap.Config.ARGB_8888); |
| |
| final Canvas canvas = new Canvas(mBitmap); |
| mView.draw(canvas); |
| } |
| |
| @Override |
| protected Boolean doInBackground(Void... ignored) { |
| final Bitmap bitmap = mBitmap; |
| if (bitmap == null) { |
| return false; |
| } |
| |
| final File file = new File(mOutDir, mName + ".png"); |
| if (file.exists() && !file.canWrite()) { |
| Log.e(TAG, "Unable to write file: " + file.getAbsolutePath()); |
| return false; |
| } |
| |
| boolean success = false; |
| try { |
| FileOutputStream stream = null; |
| try { |
| stream = new FileOutputStream(file); |
| success = bitmap.compress(CompressFormat.PNG, 100, stream); |
| } finally { |
| if (stream != null) { |
| stream.flush(); |
| stream.close(); |
| } |
| } |
| } catch (Exception e) { |
| Log.e(TAG, e.getMessage()); |
| } finally { |
| bitmap.recycle(); |
| } |
| |
| return success; |
| } |
| } |