java - 使用 MediaRecorder 在 Android 上录制屏幕时无法获取 Surface

Question

我想录下我的手机屏幕。当我在 API 23 上测试它时它工作正常但是当我在 api 22 上测试代码时它无法获得表面，但代码在 android marshmallow 上运行良好。

private VirtualDisplay createVirtualDisplay()
{
    return mMediaProjection.createVirtualDisplay("MainActivity",
            DISPLAY_WIDTH, DISPLAY_HEIGHT, mScreenDensity,
            DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
            mMediaRecorder.getSurface(), null /*Callbacks*/, null
            /*Handler*/);
}

在

上收到错误

mMediaRecorder.getSurface()

这是错误 的屏幕截图

Answer 1

我遇到了同样的问题。授予运行时权限。

if (ContextCompat.checkSelfPermission(TestInstructions.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
        + ContextCompat.checkSelfPermission(TestInstructions.this,
                Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {
    if (ActivityCompat.shouldShowRequestPermissionRationale(TestInstructions.this,
            Manifest.permission.WRITE_EXTERNAL_STORAGE)
            || ActivityCompat.shouldShowRequestPermissionRationale(TestInstructions.this,
                    Manifest.permission.RECORD_AUDIO)) {
        Snackbar.make(relativeLayout, R.string.label_permissions, Snackbar.LENGTH_INDEFINITE)
                .setAction("ENABLE", new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        ActivityCompat.requestPermissions(TestInstructions.this, new String[] {
                                Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.RECORD_AUDIO },
                                REQUEST_PERMISSIONS);
                    }
                }).show();
    } else {
        ActivityCompat.requestPermissions(TestInstructions.this,
                new String[] { Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.RECORD_AUDIO },
                REQUEST_PERMISSIONS);
    }
}

它将解决您的问题。