在$ P $图像采集应用程序崩溃pssing后退按钮

public class MainActivity extends Activity {
private static final int CAMERA_PIC_REQUEST = 2500;
Button Report_help;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Report_help=(Button)findViewById(R.id.report_help);
    Report_help.setOnClickListener(new OnClickListener()
    {
        public void onClick(View v) {
             Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
             startActivityForResult(cameraIntent, CAMERA_PIC_REQUEST);
        }
    });

}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == CAMERA_PIC_REQUEST) {
          Bitmap image = (Bitmap) data.getExtras().get("data");
          ImageView imageview = (ImageView) findViewById(R.id.display_image);
          imageview.setImageBitmap(image);
    }
}

}

该应用程序捕获图像，并显示在imageview.But问题是我捕捉到的图像和preSS后退按钮应用crashes.I不知道为什么会这样以后？请任何人的帮助。

This app captures the image and displays in the imageview.But the problem is after I capture the image and press the back button app crashes.I don't know why is this so? Please anyone help.