android获取屏幕显示内容

Android获取屏幕显示内容有两种方式：

1. 使用MediaProjection API

使用MediaProjection API可以截屏并将屏幕上的内容转换为视频流，然后可以对视频流进行处理。以下是获取屏幕截图的代码示例：

private MediaProjectionManager mMediaProjectionManager;
private MediaProjection mMediaProjection;
private ImageReader mImageReader;

private void startScreenCapture() {
    mMediaProjectionManager = (MediaProjectionManager) getSystemService(MEDIA_PROJECTION_SERVICE);

    Intent captureIntent = mMediaProjectionManager.createScreenCaptureIntent();
    startActivityForResult(captureIntent, REQUEST_CODE);

    mImageReader = ImageReader.newInstance(width, height, PixelFormat.RGBA_8888, 2);
    mMediaProjection = mMediaProjectionManager.getMediaProjection(resultCode, resultData);
    mMediaProjection.createVirtualDisplay("ScreenCapture",
            width, height, densityDpi,
            DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
            mImageReader.getSurface(), null, null);
}

private void stopScreenCapture() {
    if (mMediaProjection != null) {
        mMediaProjection.stop();
        mMediaProjection = null;
    }
    if (mImageReader != null) {
        mImageReader.close();
        mImageReader = null;
    }
}

2. 使用AccessibilityService

使用AccessibilityService可以获取屏幕上的所有视图，并对其进行操作。以下是获取屏幕上所有TextView的代码示例：

public class MyAccessibilityService extends AccessibilityService {
    @Override
    public void onAccessibilityEvent(AccessibilityEvent event) {
        if (event.getEventType() == AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED) {
            AccessibilityNodeInfo rootNode = getRootInActiveWindow();
            if (rootNode != null) {
                List<AccessibilityNodeInfo> textViews = rootNode.findAccessibilityNodeInfosByViewId("android:id/text1");
                for (AccessibilityNodeInfo textView : textViews) {
                    Log.d(TAG, "TextView text: " + textView.getText());
                }
            }
        }
    }

    @Override
    public void onInterrupt() {}

    @Override
    protected void onServiceConnected() {
        super.onServiceConnected();
        AccessibilityServiceInfo config = new AccessibilityServiceInfo();
        config.eventTypes = AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED;
        config.feedbackType = AccessibilityServiceInfo.FEEDBACK_GENERIC;
        config.flags = AccessibilityServiceInfo.DEFAULT;
        setServiceInfo(config);
    }
}

需要注意的是，使用AccessibilityService获取屏幕内容需要用户授权。