第一种 调用“su”命令执行截屏
执行“su”命令，需要设置为系统程序，android:sharedUserId="android.uid.system"，需要root权限。
方法如下：
/**
* 屏幕截图
* 适用于lanucher版
*/
public static void shotScreen() {
//adb截图方法
new Thread(new Runnable() {
@Override
public void run() {
Log.e("whh0914", "开始屏幕截图...");
String filepath = "/sdcard/screenShot.png";
try {
RootCmdUtils.execRootCmdSilent("screencap -p " + filepath);
} catch (Exception e) {
Log.e("whh0914", "屏幕截图出现异常：" + e.toString());
}
}
}).start();
}
/**
* 执行命令但不关注结果输出
*/
public static int execRootCmdSilent(String cmd) {
int result = -1;
DataOutputStream dos = null;
try {
Process p = Runtime.getRuntime().exec("su");
dos = new DataOutputStream(p.getOutputStream());
dos.writeBytes(cmd + "\n");
dos.flush();
dos.writeBytes("exit\n");
dos.flush();
p.waitFor();
result = p.exitValue();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (dos != null) {
try {
dos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return result;
}
否则会报
java.io.IOException: Cannot run program : error=13, Permission denied
优缺点：命令行简单方便，对于复杂的页面或存在帧流(surfaceView等控件)也能轻松获取截屏，但是运行到手机上，由于硬件限制，系统权限基本难拿到，容易出异常而导致方法失效，因此该方法依硬件权限按需取
第二种 原生的截图方法，获取View的缓存作为截屏结果
/**
* 屏幕截图
*/
public static void screenShot1(Activity activity, ScreenShotReqBean screenShotReqBean) {
String filepath = "/sdcard/screenShot.png";
Bitmap bitmap = null;
try {
Log.e("whh0914", "111开始屏幕截图...");
//截图
activity.getWindow().getDecorView().setDrawingCacheEnabled(true);
bitmap = activity.getWindow().getDecorView().getDrawingCache();
//保存图片
FileOutputStream fos = new FileOutputStream(filepath);
bitmap.compress(Bitmap.CompressFormat.PNG, 50, fos);
} catch (Exception e) {
Log.e("whh0914", "111屏幕截图出现异常：" + e.toString());
}
}
优缺点：原生的截图方法，依赖于界面的内容，如果界面中包含webView、surfaceView等控件，截图出来该控件区域出现一片黑，无法达到截图到帧的效果。因此该方法按界面控件按需取。
第三种 通过 MediaProjectionManager 获取截图
public static final int EVENT_SCREENSHOT = 22;//截图事件
private MediaProjectionManager mediaProjectionManager;
private MediaProjection mediaProjection;
private Image image;
public void takeScreenShot() {
mediaProjectionManager = (MediaProjectionManager)
getApplication().getSystemService(Context.MEDIA_PROJECTION_SERVICE);
startActivityForResult(mediaProjectionManager.createScreenCaptureIntent(), EVENT_SCREENSHOT);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
Log.e("whh0914", "onActivityResult...requestCode=" + requestCode + ",resultCode=" + resultCode);
if (requestCode == EVENT_SCREENSHOT) {
super.onActivityResult(requestCode, resultCode, data);
Log.e("whh0914", "captureScreen...");
DisplayMetrics displayMetrics = new DisplayMetrics();
WindowManager windowManager = (WindowManager) this.getSystemService(WINDOW_SERVICE);
windowManager.getDefaultDisplay().getMetrics(displayMetrics);
int width = displayMetrics.widthPixels;
int height = displayMetrics.heightPixels;
Log.e("whh0914", "displayMetrics width=" + width + ", height=" + height);
ImageReader mImageReader = ImageReader.newInstance(width, height, PixelFormat.RGBA_8888, 2);
mediaProjection = mediaProjectionManager.getMediaProjection(resultCode, data);
VirtualDisplay virtualDisplay = mediaProjection.createVirtualDisplay("screen-mirror", width, height,
displayMetrics.densityDpi, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, mImageReader.getSurface(), null, null);
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
try {
image = mImageReader.acquireLatestImage();
if (image != null) {
final Image.Plane[] planes = image.getPlanes();
final ByteBuffer buffer = planes[0].getBuffer();
int width = image.getWidth();
int height = image.getHeight();
Log.e("whh0914", "image width=" + width + ", height=" + height);
int pixelStride = planes[0].getPixelStride();
int rowStride = planes[0].getRowStride();
int rowPadding = rowStride - pixelStride * width;
Bitmap bitmap = Bitmap.createBitmap(width + rowPadding / pixelStride, height, Bitmap.Config.ARGB_8888);
bitmap.copyPixelsFromBuffer(buffer);
bitmap = Bitmap.createScaledBitmap(bitmap, bitmap.getWidth(), bitmap.getHeight(), false);
if (bitmap != null) {
Log.e("whh0914", "屏幕截图成功!");
saveBitmap(bitmap, "/sdcard/screenShot.png");
}
bitmap.recycle();
}
} catch (Exception e) {
Log.e("whh0914", "截图出现异常：" + e.toString());
} finally {
if (image != null) {
image.close();
}
if (mImageReader != null) {
mImageReader.close();
}
if (virtualDisplay != null) {
virtualDisplay.release();
}
//必须代码，否则出现BufferQueueProducer: [ImageReader] dequeueBuffer: BufferQueue has been abandoned
mImageReader.setOnImageAvailableListener(null, null);
mediaProjection.stop();
}
}
}, 100);
}
}
//保存bitmap文件
public static void saveBitmap(Bitmap bitmap, String filePath) {
File f = new File(filePath);
FileOutputStream out = null;
try {
out = new FileOutputStream(f);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
try {
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
优缺点：完美地解决了方法一、方法二存在的问题，完美！无需root权限，不用考虑界面中surfaceView等控件渲染问题。但是只能获取到当前APP内部正在运行Activity的截图，如果需要多个界面截图，最好在BaseActivity使用。如果需要获取APP外部界面截图，可通过读取framebuffer内容，解析图片。
