Java 如何在关闭应用程序之前停止textureview侦听器并显示图像
我有一个简单的xml布局,如下所示,在FrameLayout中只有一个TextureView 以及以下主要活动:Java 如何在关闭应用程序之前停止textureview侦听器并显示图像,java,android,textureview,Java,Android,Textureview,我有一个简单的xml布局,如下所示,在FrameLayout中只有一个TextureView 以及以下主要活动: public class MainActivity extends Activity implements TextureView.SurfaceTextureListener { private static final String TAG = "MainActivity"; // Local references to layout components
public class MainActivity extends Activity
implements TextureView.SurfaceTextureListener {
private static final String TAG = "MainActivity";
// Local references to layout components
private TextureView mTxvCameraPreview;
// Camera manager
private CameraManager mCameraManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Initialize layout and components
setContentView(R.layout.activity_main);
mTxvCameraPreview = (TextureView)findViewById(R.id.txv_camera_preview);
// Camera managing
mCameraManager = new CameraManager(this);
mTxvCameraPreview.setSurfaceTextureListener(this);
}
@Override
protected void onResume() {
super.onResume();
if (mTxvCameraPreview.isAvailable())
mCameraManager.startPreview(mTxvCameraPreview.getSurfaceTexture());
}
@Override
protected void onPause() {
super.onPause();
mCameraManager.stopPreview();
}
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
mCameraManager.startPreview(surface);
}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
mCameraManager.stopPreview();
return true;
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {} // Unused
@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {} // Unused
}
对于每一个框架,我都做了一些细化,这是可以的。
我想要的是添加一个按钮,停止相机并显示在TextureView中从SD卡加载文件
这方面的伪代码可以是这样的:
public void onButtonClicked(View view) {
// stop the surface listener (it is needed?)
File imgFile = new File(“/sdcard/Images/elaboration_result.jpg”);
Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
// show myBitmap on TextureView (if possible)
}
是否可以在不修改xml布局的情况下执行此操作?
提前谢谢 恐怕你是手工操作的。最好的办法是在TextureView上创建一个新的ImageView,并在需要时设置其图像
public void onButtonClicked(View view) {
// if we don't need to keep previewing new frames, stop the preview
mCameraManager.stopPreview();
// now, show our ImageView (which should be in front of the TextureView)
Bitmap myBitmap = BitmapFactory.decodeFile(file_path_here);
myImageView.setImageBitmap(myBitmap);
myImageView.setVisibility(View.VISIBLE);
}
无需创建另一个图像。只用
textureView.getBitmap(file.getAbsolutePath);
您应该能够通过停止摄影机预览来断开摄影机与TextureView的连接,然后锁定曲面以获得画布并绘制位图。你可能回不去了——一旦你把画布连接到一个表面上,它就不想放手了——但是如果你无论如何都要结束活动,那就没关系了。好的,谢谢,但是我该怎么做呢?有人能完成我写的伪代码吗?再次感谢!