從事Android開發(fā)的道友一定碰到過這樣的需求：把UI布局轉(zhuǎn)換成圖片保存到本地或者分享出去。在查閱了大量網(wǎng)上資料后發(fā)現(xiàn)，最常用的解決方案不外乎以下兩種：

1、使用View自帶的DrawingCache機(jī)制獲取Bitmap（This method was deprecated in API level 28）

//開啟DrawingCache
targetView.setDrawingCacheEnabled(true);
//構(gòu)建開啟DrawingCache
targetView.buildDrawingCache();
//獲取Bitmap
Bitmap drawingCache = targetView.getDrawingCache();
//方法回調(diào)
getCacheResult.result(drawingCache);
//銷毀DrawingCache
targetView.destroyDrawingCache();

2、使用PixelCopy提供的像素復(fù)制能力，完成從Surface到位圖的復(fù)制操作（Added in API level 24）

//準(zhǔn)備一個(gè)bitmap對象，用來接收copy出來的像素
final Bitmap bitmap = Bitmap.createBitmap(targetView.getWidth(), targetView.getHeight(), Bitmap.Config.ARGB_8888);
//獲取layout的left-top頂點(diǎn)位置
final int[] location = new int[2];
targetView.getLocationInWindow(location);
//請求轉(zhuǎn)換
PixelCopy.request(activity.getWindow(),
        new Rect(location[0], location[1], location[0] + targetView.getWidth(), location[1] + targetView.getHeight()),
        bitmap, new PixelCopy.OnPixelCopyFinishedListener() {
            @Override
            public void onPixelCopyFinished(int copyResult) {
                //如果成功
                if (copyResult == PixelCopy.SUCCESS) {
                    //方法回調(diào)
                    getCacheResult.result(bitmap);
                }
            }
        }, new Handler(Looper.getMainLooper()));

盡管以上兩種方法都可以實(shí)現(xiàn)需求，但是官方推薦使用PixelCopy API，因此我們在新設(shè)備上應(yīng)該盡量使用新API。

綜合方法：

/**
 * View轉(zhuǎn)換成Bitmap
 *
 * @param targetView     targetView
 * @param getCacheResult 轉(zhuǎn)換成功回調(diào)接口
 */
public static void getBitmapFromView(@NotNull Activity activity, View targetView, final CacheResult getCacheResult) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        //準(zhǔn)備一個(gè)bitmap對象，用來將copy出來的區(qū)域繪制到此對象中
        final Bitmap bitmap = Bitmap.createBitmap(targetView.getWidth(), targetView.getHeight(), Bitmap.Config.ARGB_8888);
        //獲取layout的left-top頂點(diǎn)位置
        final int[] location = new int[2];
        targetView.getLocationInWindow(location);
        //請求轉(zhuǎn)換
        PixelCopy.request(activity.getWindow(),
                new Rect(location[0], location[1], 
                        location[0] + targetView.getWidth(), location[1] + targetView.getHeight()),
                bitmap, new PixelCopy.OnPixelCopyFinishedListener() {
                    @Override
                    public void onPixelCopyFinished(int copyResult) {
                        //如果成功
                        if (copyResult == PixelCopy.SUCCESS) {
                            //方法回調(diào)
                            getCacheResult.result(bitmap);
                        }
                    }
                }, new Handler(Looper.getMainLooper()));
    } else {
        //開啟DrawingCache
        targetView.setDrawingCacheEnabled(true);
        //構(gòu)建開啟DrawingCache
        targetView.buildDrawingCache();
        //獲取Bitmap
        Bitmap drawingCache = targetView.getDrawingCache();
        //方法回調(diào)
        getCacheResult.result(drawingCache);
        //銷毀DrawingCache
        targetView.destroyDrawingCache();
    }
}