Android截屏的几种方法

第一种：5.0 之后开放了截屏的方法

if (Build.VERSION.SDK_INT >= 21) {
    startActivityForResult(((MediaProjectionManager) getSystemService("media_projection")).createScreenCaptureIntent(),1);
} else {
    Log.e("TAG", "版本过低,无法截屏");
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    switch (requestCode) {
        case REQUEST_MEDIA_PROJECTION: {
            if (resultCode == -1 && data != null) {
                parseData(data);
            }
        }
    }
}

private void parseData(Intent data){
	MediaProjection mMediaProjection = (MediaProjectionManager).getSystemService(
            Context.MEDIA_PROJECTION_SERVICE).getMediaProjection(Activity.RESULT_OK,data);
        ImageReader mImageReader = ImageReader.newInstance(
                getScreenWidth(),
                getScreenHeight(),
                PixelFormat.RGBA_8888,1);

	VirtualDisplay mVirtualDisplay = mMediaProjection.createVirtualDisplay("screen-mirror",
            getScreenWidth(),
            getScreenHeight(),
            Resources.getSystem().getDisplayMetrics().densityDpi,
            DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
            mImageReader.getSurface(), null, null);

	Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
       @Override
       public void run() {
           Image image = mImageReader.acquireLatestImage();
           // TODO 将image保存到本地即可
       }
    }, 300);

	mVirtualDisplay.release();
	mVirtualDisplay = null;
}

第二种：使用 decorView

public static Bitmap capture(Activity activity) {
    activity.getWindow().getDecorView().setDrawingCacheEnabled(true);
    Bitmap bmp = activity.getWindow().getDecorView().getDrawingCache();
    return bmp;
}

public static Bitmap shotActivity(Activity ctx) {
    View view = ctx.getWindow().getDecorView();
    view.setDrawingCacheEnabled(true);
    view.buildDrawingCache();
    Bitmap bp = Bitmap.createBitmap(view.getDrawingCache(), 0, 0, view.getMeasuredWidth(),
    view.getMeasuredHeight());
    view.setDrawingCacheEnabled(false);
    view.destroyDrawingCache();
    return bp;
}

长截屏
ScrollView 截屏

public static Bitmap shotScrollView(ScrollView scrollView) {
    int h = 0;
    Bitmap bitmap = null;
    for (int i = 0; i < scrollView.getChildCount(); i++) {
        h += scrollView.getChildAt(i).getHeight();
        scrollView.getChildAt(i).setBackgroundColor(Color.parseColor("#ffffff"));
    }
    bitmap = Bitmap.createBitmap(scrollView.getWidth(), h, Bitmap.Config.RGB_565);
    final Canvas canvas = new Canvas(bitmap);
    scrollView.draw(canvas);
    return bitmap;
}

ListView 截屏

public static Bitmap shotListView(ListView listview) {
    ListAdapter adapter = listview.getAdapter();
    int itemscount = adapter.getCount();
    int allitemsheight = 0;
    List<Bitmap> bmps = new ArrayList<Bitmap>();
    for (int i = 0; i < itemscount; i++) {
        View childView = adapter.getView(i, null, listview);
        childView.measure(
        View.MeasureSpec.makeMeasureSpec(listview.getWidth(), View.MeasureSpec.EXACTLY),
        View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        childView.layout(0, 0, childView.getMeasuredWidth(), childView.getMeasuredHeight());
        childView.setDrawingCacheEnabled(true);
        childView.buildDrawingCache();
        bmps.add(childView.getDrawingCache());
        allitemsheight += childView.getMeasuredHeight();
    }

    Bitmap bigbitmap = Bitmap.createBitmap(listview.getMeasuredWidth(), allitemsheight, Bitmap.Config.ARGB_8888);
    Canvas bigcanvas = new Canvas(bigbitmap);
    Paint paint = new Paint();
    int iHeight = 0;

    for (int i = 0; i < bmps.size(); i++) {
        Bitmap bmp = bmps.get(i);
        bigcanvas.drawBitmap(bmp, 0, iHeight, paint);
        iHeight += bmp.getHeight();
        bmp.recycle();
        bmp = null;
    }
    return bigbitmap;
}

recyclerView 截屏

public static Bitmap shotRecyclerView(RecyclerView view) {
    RecyclerView.Adapter adapter = view.getAdapter();
    Bitmap bigBitmap = null;
    if (adapter != null) {
      int size = adapter.getItemCount();
      int height = 0;
      Paint paint = new Paint();
      int iHeight = 0;
      final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);

      // Use 1/8th of the available memory for this memory cache.
      final int cacheSize = maxMemory / 8;
      LruCache<String, Bitmap> bitmaCache = new LruCache<>(cacheSize);
      for (int i = 0; i < size; i++) {
        RecyclerView.ViewHolder holder = adapter.createViewHolder(view, adapter.getItemViewType(i));
        adapter.onBindViewHolder(holder, i);
        holder.itemView.measure(
            View.MeasureSpec.makeMeasureSpec(view.getWidth(), View.MeasureSpec.EXACTLY),
            View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(),
            holder.itemView.getMeasuredHeight());
        holder.itemView.setDrawingCacheEnabled(true);
        holder.itemView.buildDrawingCache();
        Bitmap drawingCache = holder.itemView.getDrawingCache();
        if (drawingCache != null) {

          bitmaCache.put(String.valueOf(i), drawingCache);
        }
        height += holder.itemView.getMeasuredHeight();
      }

      bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), height, Bitmap.Config.ARGB_8888);
      Canvas bigCanvas = new Canvas(bigBitmap);
      Drawable lBackground = view.getBackground();
      if (lBackground instanceof ColorDrawable) {
        ColorDrawable lColorDrawable = (ColorDrawable) lBackground;
        int lColor = lColorDrawable.getColor();
        bigCanvas.drawColor(lColor);
      }

      for (int i = 0; i < size; i++) {
        Bitmap bitmap = bitmaCache.get(String.valueOf(i));
        bigCanvas.drawBitmap(bitmap, 0f, iHeight, paint);
        iHeight += bitmap.getHeight();
        bitmap.recycle();
      }
    }
    return bigBitmap;
}

第三种：使用 screencap 命令

adb shell screencap -p /sdcard/sreenshot1.png

// 第四种：完美截屏(优雅的方案实现屏幕截图，利用android 5.0之后的录屏API实现截屏)
https://github.com/BruceWind/AndroidScreenShot_SysApi

// 第五种：通过 /dev/graphics/fb0 获取屏幕截屏

FileInputStream graphics = null;
try {
    graphics = new FileInputStream(“/dev/graphics/fb0”);
} catch (FileNotFoundException e) {
    e.printStackTrace();
    return null;
}

DataInputStream dStream = new DataInputStream(graphics);
dStream.readFully(piex);
dStream.close();

int[] colors = new int[screenHeight * screenWidth];
// 将rgb转为色值
for (int m = 0; m < colors.length; m++) {
    int r = (piex[m * 4] & 0xFF);
    int g = (piex[m * 4 + 1] & 0xFF);
    int b = (piex[m * 4 + 2] & 0xFF);
    int a = (piex[m * 4 + 3] & 0xFF);
    colors[m] = (a << 24) + (r << 16) + (g << 8) + b;
}
Bitmap bitmap = Bitmap.createBitmap(colors, screenWidth, screenHeight, Bitmap.Config.ARGB_8888);

仿 wechat 和支付宝防止截屏？？？
getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE)
设置安全窗口，禁用系统截屏。防止 App 中的一些界面被截屏，并显示在其他设备中造成信息泄漏。（常见手机设备系统截屏操作方式为：同时按下电源键和音量键。）
比如支付宝 App 的“向商家付款”的包含付款二维码的界面。（补充说明一点，微信付款界面不是这么做的，采用的是在 onResume() 生命周期方法中实时刷新付款二维码，与支付宝在安全方法采取的手段不同。）

https://android-notes.github.io/2016/12/03/android%E9%95%BF%E6%88%AA%E5%B1%8F%E5%8E%9F%E7%90%86/
https://juejin.im/post/5a33403b6fb9a045132abdb6
https://mp.weixin.qq.com/s/JPVZtErFTzJ5PDuTAPk0DA

Android截屏的几种方法

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