Question

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

    mTextureView = (TextureView) findViewById(R.id.textureView1);
    mTextureView.setSurfaceTextureListener(this);
    }
 @Override
    public void onSurfaceTextureAvailable(SurfaceTexture surface, int width,
        int height) {
        mCamera = Camera.open(0);

    try {
        mCamera.setPreviewTexture(surface);
    } catch (IOException e) {

        e.printStackTrace();
    }

    mCamera.startPreview();


}

@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
    mCamera.stopPreview();
            mCamera.release();

    return false;
}

@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width,
        int height) {
    // TODO Auto-generated method stub

}

@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {
    // TODO Auto-generated method stub

}

目前，当我运行此程序时，相机会自动启动。如何在按钮点击时启动相机。我尝试使用点击按钮。但是屏幕上没有可用的纹理视图。请建议

Answer 1

你的布局文件中应该有一个按钮和一个TextureView，如

您的相机正在自动呼叫，因为只要您的TextureView准备好就会调用onSurfaceTextureAvailable。因此，您可以在onSurfaceTextureAvailable内准备好TextureView之后设置一个按钮监听器，而不是调用Camera目录。

以下是相同的代码段。

在 main_layout.xml

内

  <TextureView
    android:id="@+id/ttv"
    android:text="@string/hello_world"
    android:layout_width="fill_parent"
    android:layout_height="match_parent" />

 <Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Hello World" />

现在内部onCreate()或OnCreateView() {如果是片段}

使用Button

获取TextureView和findViewById(...)

 public class MainActivity extends ActionBarActivity implements TextureView.SurfaceTextureListener{

   TextureView tv;
   Button b;

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

    tv = (TextureView) rootView.findViewById(R.id.ttv);
    tv.setSurfaceTextureListener(this);

    b = (Button) rootView.findViewById(R.id.button);

  }

   @TargetApi(Build.VERSION_CODES.HONEYCOMB)

    @Override
    public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {

        final SurfaceTexture surfaceT = surface;
        b.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mCamera = Camera.open(0);

                try {
                    mCamera.setPreviewTexture(surfaceT);
                } catch (IOException e) {
                    e.printStackTrace();
                }

                mCamera.startPreview();
            }
        });


    }

    @Override
    public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {

    }

    @Override
    public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
        mCamera.stopPreview();
        mCamera.release();

        return false;
    }

    @Override
    public void onSurfaceTextureUpdated(SurfaceTexture surface) {

    }
 }

不要忘记在清单文件中添加这些摄像机权限和功能：

<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />

在textureview上单击按钮启动相机

1 个答案: