Java Android摄像头:点击按钮调用预览回调
在框架布局中显示相机。我想通过点击按钮从相机上获取预览画面,但作为一个android新手,我不知道该怎么做。任何帮助都将不胜感激。谢谢 我的代码如下:Java Android摄像头:点击按钮调用预览回调,java,android,android-camera,onclicklistener,Java,Android,Android Camera,Onclicklistener,在框架布局中显示相机。我想通过点击按钮从相机上获取预览画面,但作为一个android新手,我不知道该怎么做。任何帮助都将不胜感激。谢谢 我的代码如下: public class MainActivity extends Activity { private Camera mCamera; private CameraPreview mPreview; @Override protected void onCreate(Bundle savedInstan
public class MainActivity extends Activity {
private Camera mCamera;
private CameraPreview mPreview;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mCamera = getCameraInstance();
// Create our Preview view and set it as the content of our activity.
mPreview = new CameraPreview(this, mCamera);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
mCamera.setDisplayOrientation(90);
preview.addView(mPreview);
findViewById(R.id.capture).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public static Camera getCameraInstance(){
Camera c = null;
try {
c = Camera.open(); // attempt to get a Camera instance
}
catch (Exception e){
// Camera is not available (in use or does not exist)
}
return c; // returns null if camera is unavailable
}
public void onPreviewFrame(byte[] data, Camera camera) {
try {
Camera.Parameters parameters = camera.getParameters();
Size size = parameters.getPreviewSize();
YuvImage image = new YuvImage(data, parameters.getPreviewFormat(),
size.width, size.height, null);
File file = new File(Environment.getExternalStorageDirectory()
.getPath() + "/out.jpg");
FileOutputStream filecon = new FileOutputStream(file);
image.compressToJpeg(
new Rect(0, 0, image.getWidth(), image.getHeight()), 90,
filecon);
} catch (FileNotFoundException e) {
Toast toast = Toast
.makeText(getBaseContext(), e.getMessage(), 1000);
toast.show();
}
}
}
首先,为我可怜的英格道歉! “获取相机预览帧”这个词是否意味着你想要拍照? 如果正确,可以在Camera类中使用takePicture()方法 如果没有,您可以在onPreviewFrame方法中使用一个标志,该标志可以由onClickListener更改为true,并且在执行任务后应更改为false。onPreviewFrame()是PreviewCallback接口中的一个方法。因此,我认为您需要创建一个实现该接口的类,并使用该对象调用camera.setPreviewCallback()。 小心原因每次帧可用时都会调用OnPreviewFrame,也就是说,在预览运行时会多次调用它