android屏幕捕捉

最新推荐文章于 2024-08-18 10:38:11 发布

原创最新推荐文章于 2024-08-18 10:38:11 发布

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#android屏幕捕捉

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这篇博客介绍了如何在Android平台上实现屏幕捕捉功能，通过实例化视频录制管理器来完成屏幕的录制操作。

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使用MediaprojectionManager 的方法来进行屏幕捕捉，VirtualDisplay来展示捕捉的屏幕截图，关键代码为：

实例化视频放映管理器

projectionManager = (MediaProjectionManager) getSystemService(
        Context.MEDIA_PROJECTION_SERVICE);
通过startActivityForResult开始捕捉屏幕Intent intent = projectionManager.createScreenCaptureIntent();
startActivityForResult(intent,CAPTURE_CODE);

//  在onActivityResult中对传来的捕捉屏幕数据进行展示

     projection = projectionManager.getMediaProjection(resultCode,data);
            virtualDisplay = projection.createVirtualDisplay("屏幕捕捉",displayWidth,displayHeight, screenDensity,
                    DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,surface, null,null);

具体代码如下：

public class ScreenCapture extends Activity implements View.OnClickListener{
    //   定义屏幕捕获的请求码
    private static final int CAPTURE_CODE = 0x123;
    private MediaProjectionManager projectionManager;
    private int screenDensity;
    private int displayWidth = 500;
    private int displayHeight = 670;
    private Surface surface;
    private SurfaceView surfaceView;
    private ToggleButton capture;
    private boolean isSharing = false;
    private MediaProjection projection;
    private VirtualDisplay virtualDisplay;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.screen_capture);
        surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
        capture = (ToggleButton) findViewById(R.id.capture);
        surface = surfaceView.getHolder().getSurface();
        //  获取屏幕分辨率
        DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        screenDensity = metrics.densityDpi;
        //  控制SurfaceView组件的宽高
        ViewGroup.LayoutParams lp = surfaceView.getLayoutParams();
        lp.width = displayWidth;
        lp.height = displayHeight;
        surfaceView.setLayoutParams(lp);
        projectionManager = (MediaProjectionManager) getSystemService(
                Context.MEDIA_PROJECTION_SERVICE);
        capture.setOnClickListener(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if(projection != null){
            projection.stop();
            projection = null;
        }
    }

    @Override
    public void onClick(View v) {
        if(((ToggleButton)v).isChecked()){
            shareScreen();
        }else{
            stopScreenSharing();
        }
    }
    //
    private void shareScreen(){
        isSharing = true;
        if(surface == null)
            return;
        if(projection == null){
            Intent intent = projectionManager.createScreenCaptureIntent();
            startActivityForResult(intent,CAPTURE_CODE);
            return;
        }
    }

    private void stopScreenSharing(){
        isSharing = false;
        if(virtualDisplay == null){
            return;
        }
        virtualDisplay.release();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == CAPTURE_CODE){
            //  若用户取消了屏幕捕捉
            if(resultCode != RESULT_OK){
                Toast.makeText(ScreenCapture.this, "用户取消屏幕捕捉", Toast.LENGTH_SHORT).show();
            }
            projection = projectionManager.getMediaProjection(resultCode,data);
            virtualDisplay = projection.createVirtualDisplay("屏幕捕捉",displayWidth,
                    displayHeight, screenDensity,
                    DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,surface, null,null);
        }
    }

}