Question

我想使用位图捕获我的Android屏幕，然后将其转换为图像。方法应该是静态的。

这是我的代码，我在其中注册了一个按钮点击，当它被点击时＃34; takeScrernshot＆＃34;捕获<activity android:name=".activity.LoginActivity" android:hardwareAccelerated="false" android:exported="true" android:label="@string/app_name" android:screenOrientation="portrait" android:windowSoftInputMode="stateHidden" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity>并将其转换为位图，然后将其保存到TextureView。

File

我有一个纹理视图，我需要注册点击，按钮创建一个屏幕截图（仅用于测试）将位图转换为文件后 - 图像为黑色

public class MainActivity extends AppCompatActivity {

    //  View rootView = getWindow().getDecorView().getRootView();
    private static TextureView textureView;
    Button button;
    SurfaceView mPreview;
    private SurfaceHolder holder;

    private static File screenshotFile;

    private static float videoWidth = 1080.0f;
    private static float videoHeight = 1920.0f;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textureView = (TextureView) findViewById(R.id.textureView);
        button = (Button) findViewById(R.id.button);

       // mPreview = (SurfaceView) findViewById(R.id.surface);
//        holder = mPreview.getHolder();
       // holder.setFormat(PixelFormat.RGBX_8888);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // takeScreenShot();
                takeScreenshotVideoPlaying();
            }
        });
    }



    public static Bitmap takeScreenshotVideoPlaying() {
        Log.d("", "takeScreenshotVideoPlaying() in VideoPlayerActivity running!");

        Bitmap bitmap = null;
        int tries = 100;
        for (int i = 1; i < tries; i++) {
            if (textureView.isAvailable()) {

                float bitmapScale = 4.0f;
                float bitmapWidth = videoWidth / bitmapScale;
                float bitmapHeight = videoHeight / bitmapScale;
                bitmap = textureView.getBitmap((int) bitmapWidth, (int) bitmapHeight);
                if (bitmap != null) {
                    Log.d("", "screenshot taken");
                    break;
                }
            }
        }
        saveScreenshot(bitmap);
        return bitmap;
    }


    private static void saveScreenshot(Bitmap bitmap) {
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();

        Date now = new Date();
        android.text.format.DateFormat.format("yyyy-MM-dd_hh:mm:ss", now);


        String mPath = Environment.getExternalStorageDirectory().toString() + "/" + now + ".jpg";
        // see if this helps the uploading to GCS

        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bytes);

        screenshotFile = new File(mPath);
        try {
            if (screenshotFile.exists()) {
                screenshotFile.delete();
            }
            if (screenshotFile.createNewFile()) {
                FileOutputStream fo = new FileOutputStream(screenshotFile);
                fo.write(bytes.toByteArray());
                fo.close();
                Log.d("Saved", "saveScreenshot: ");

            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}



**and this is how layout looks like:**

Answer 1

问题是，我一直试图截取textureView，这会渲染视频，所以当我尝试getBitmap屏幕时，由于图像每次都在变化，我获得了黑屏。为了捕获视频我使用了两种不同的方法： - 对于有根设备，我使用鼠标光标或屏幕上的任何其他内容捕获整个屏幕：

 private static Bitmap takeScreenshot() {
        Bitmap screen;
        Bitmap resizedBitmap = null;
        try {
            Process sh = Runtime.getRuntime().exec("su", null, null);

            OutputStream os = sh.getOutputStream();
            Log.d("SCREENSHOT ", "PATH: " + ActFileUtil.getPathToScreenshotDirOnDevice());
            os.write(("/system/bin/screencap -p " + ActFileUtil.getPathToScreenshotDirOnDevice()).getBytes("ASCII"));
            os.flush();
            os.close();
            sh.waitFor();
            Log.d(TAG, "procScreenshot: SCREENSHOT TAKEN");
            screen = BitmapFactory.decodeFile(ActFileUtil.getPathToScreenshotDirOnDevice());
            if(screen != null) {
                resizedBitmap = Bitmap.createScaledBitmap(screen, screen.getWidth() / 4, screen.getHeight() / 4, true);
            }


        } catch (IOException | NullPointerException | InterruptedException e) {
            e.printStackTrace();
        }

        return resizedBitmap;
    }

对于没有root的设备，我只使用method的内置MediaPlayer：

位图bm = mMediaPlayer.getCurrentFrame（）;

截图时的黑色图像

1 个答案: