1：效果如图
2：权限
3：实现
public class MainActivity extends AppCompatActivity { private static final String TAG = "TAGA"; int x = 1; private static final int REQUEST_MEDIA_PROJECTION = 1; private MediaProjectionManager projectionManager; boolean screenCapture = false; Handler mHandler = new Handler() { @TargetApi(Build.VERSION_CODES.LOLLIPOP) @Override public void handleMessage(Message msg) { super.handleMessage(msg); takeScreenshot2(); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button btn = findViewById(R.id.btn); btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { x=1; showAlertDialog(); mHandler.sendEmptyMessageDelayed(100,1000); } }); } @TargetApi(Build.VERSION_CODES.LOLLIPOP) @RequiresApi(api = Build.VERSION_CODES.KITKAT) @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { if (requestCode == REQUEST_MEDIA_PROJECTION ) { try { final int mWidth = getWindowManager().getDefaultDisplay().getWidth(); final int mHeight = getWindowManager().getDefaultDisplay().getHeight(); final ImageReader mImageReader = ImageReader.newInstance(mWidth, mHeight, PixelFormat.RGBA_8888, 2); DisplayMetrics metrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(metrics); int mScreenDensity = metrics.densityDpi; final MediaProjection mProjection = projectionManager.getMediaProjection(-1, data); final VirtualDisplay virtualDisplay = mProjection.createVirtualDisplay("screen-mirror", mWidth, mHeight, mScreenDensity, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, mImageReader.getSurface(), null, null); mImageReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() { @Override public void onImageAvailable(ImageReader reader) { if (x != 1) { return; } else { try { /** * 去掉--->mProjection.stop(); 会出现不停的截图现象 */ x = 2; mProjection.stop(); Image image = mImageReader.acquireLatestImage(); final Image.Plane[] planes = image.getPlanes(); final ByteBuffer buffer = planes[0].getBuffer(); int offset = 0; int pixelStride = planes[0].getPixelStride(); int rowStride = planes[0].getRowStride(); int rowPadding = rowStride - pixelStride * mWidth; Bitmap bitmap = Bitmap.createBitmap(mWidth + rowPadding / pixelStride, mHeight, Bitmap.Config.ARGB_8888); bitmap.copyPixelsFromBuffer(buffer); image.close(); // 保存路径 String pathImage = Environment.getExternalStorageDirectory().getPath() + File.separator + "AA" + File.separator; String nameImage = pathImage+"截图示例.png"; if (bitmap != null) { try { File fileImage = new File(nameImage); if (!fileImage.exists()) { fileImage.createNewFile(); } FileOutputStream out = new FileOutputStream(fileImage); if (out != null) { bitmap.compress(Bitmap.CompressFormat.PNG, 100, out); out.flush(); out.close(); Toast.makeText(MainActivity.this, "图片保存成功!", Toast.LENGTH_SHORT).show(); Intent media = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); Uri contentUri = Uri.fromFile(fileImage); media.setData(contentUri); getApplicationContext().sendBroadcast(media); screenCapture = false; } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } else { Toast.makeText(MainActivity.this, "cannot get phone's screen", Toast.LENGTH_SHORT).show(); } } catch (Exception e) { e.printStackTrace(); } } } }, null); } catch (Exception e) { e.printStackTrace(); } } } /** * 截图功能调用 */ @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) public void takeScreenshot2() { try { projectionManager = (MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE); startActivityForResult( projectionManager.createScreenCaptureIntent(), REQUEST_MEDIA_PROJECTION); } catch (Exception e) { e.printStackTrace(); } } public void showAlertDialog() { AlertDialog.Builder localBuilder = new AlertDialog.Builder(this); localBuilder.setTitle("简单对话框"); localBuilder.setIcon(R.mipmap.ic_launcher); localBuilder.setMessage("提示信息？"); localBuilder.setPositiveButton("确定", new DialogInterface.OnClickListener() { public void onClick(DialogInterface paramAnonymousDialogInterface, int paramAnonymousInt) { /** * 确定操作 * */ } }); localBuilder.setNegativeButton("取消", new DialogInterface.OnClickListener() { public void onClick(DialogInterface paramAnonymousDialogInterface, int paramAnonymousInt) { /** * 确定操作 * */ } }); /*** * 设置点击返回键不会消失 * */ localBuilder.setCancelable(false).create(); localBuilder.show(); }}