自定义视图已调用setOnTouchListener，但不会覆盖performClick（类扩展Activity NOT View） [英] Custom view has setOnTouchListener called on it but does not override performClick (class extends Activity NOT View)
问题描述
我创建了一个实现一点OpenCV的Android Activity。它的作用是简单地创建一个自定义相机视图，当触摸屏幕时，照片将被保存。
I have created an Android Activity implementing a bit of OpenCV. What it does is to simply create a Custom Camera View, and when the screen is touched, the photo will be saved.
我唯一的问题是代码 mOpenCvCameraView.setOnTouchListener（MainActivity.this）; BaseLoaderCallback中的包含警告。
My only problem is that the code mOpenCvCameraView.setOnTouchListener(MainActivity.this); inside the BaseLoaderCallback contains a warning.
mOpenCvCameraView.setOnTouchListener （MainActivity.this）; 警告
自定义视图com / example / zcameratestv2 / Version2CameraView已调用setOnTouchListener但它不会覆盖performClick
Custom view com/example/zcameratestv2/Version2CameraView has setOnTouchListener called on it but does not override performClick
与其他问题不同，我的类扩展了一个Activity而不是View，所以当我尝试覆盖函数时code> private boolean performClick（）{... super.performClick（）; } 无法识别。这是我的课程
Unlike other questions, my class extends an Activity not View, so when i try to override the function private boolean performClick() { ...super.performClick(); } it is not recognized. Here are my classes
package com.example.zcameratestv2;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.OpenCVLoader;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.core.Mat;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.SurfaceView;
import android.view.View;
import android.view.WindowManager;
import android.view.View.OnTouchListener;
import android.widget.Toast;
public class MainActivity extends Activity implements CvCameraViewListener, OnTouchListener {
private Version2CameraView mOpenCvCameraView;
private static final String TAG = "Version 2::Activity";
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status) {
case LoaderCallbackInterface.SUCCESS:
{
Log.i(TAG, "OpenCV loaded successfully");
mOpenCvCameraView.enableView();
mOpenCvCameraView.setOnTouchListener(MainActivity.this);
} break;
default:
{
super.onManagerConnected(status);
} break;
}
}
};
public MainActivity() {
Log.i(TAG, "Version 2 Class instantiated");
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
setContentView(R.layout.activity_main);
mOpenCvCameraView = (Version2CameraView) findViewById(R.id.java_surface_view);
mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
mOpenCvCameraView.setCvCameraViewListener(this);
}
public void onPause()
{
super.onPause();
if (mOpenCvCameraView != null)
mOpenCvCameraView.disableView();
}
@Override
public void onResume()
{
super.onResume();
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this, mLoaderCallback);
}
public void onDestroy() {
super.onDestroy();
if (mOpenCvCameraView != null)
mOpenCvCameraView.disableView();
}
@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;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onCameraViewStarted(int width, int height) {
// TODO Auto-generated method stub
}
@Override
public void onCameraViewStopped() {
// TODO Auto-generated method stub
}
@Override
public Mat onCameraFrame(Mat inputFrame) {
// TODO Auto-generated method stub
return null;
}
@SuppressLint("SimpleDateFormat")
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
//some code....
break;
case MotionEvent.ACTION_UP:
Log.i(TAG,"onTouch event");
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss");
String currentDateandTime = sdf.format(new Date());
String fileName = Environment.getExternalStorageDirectory().getPath() +
"/sample_picture_" + currentDateandTime + ".jpg";
mOpenCvCameraView.takePicture(fileName);
Toast.makeText(this, fileName + " saved", Toast.LENGTH_SHORT).show();
v.performClick();
break;
default:
break;
}
return true;
}
}
以前 public boolean onTouch（View v，MotionEvent event）事件有类似于OnTouchListener的类似警告，它显示我应该使用performClick（）;方法，但我不能覆盖它，因为我扩展到活动而不是查看。我发现应用 v.PerformClick（）; 修复此问题。
Previously the public boolean onTouch(View v, MotionEvent event) event had a similar warning similar to the OnTouchListener, it displays that I should use a performClick(); method but I cant override it since I extend to an Activity not a View. And I have discovered that applying v.PerformClick(); fixes this.
这个其他类处理相机进程
This other class handles the camera processes
package com.example.zcameratestv2;
import java.io.FileOutputStream;
import org.opencv.android.JavaCameraView;
import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.util.AttributeSet;
import android.util.Log;
public class Version2CameraView extends JavaCameraView implements PictureCallback {
private static final String TAG = "Version2::CameraView";
private String mPictureFileName;
public Version2CameraView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void takePicture(final String fileName) {
Log.i(TAG, "Taking picture");
this.mPictureFileName = fileName;
// Postview and jpeg are sent in the same buffers if the queue is not empty when performing a capture.
// Clear up buffers to avoid mCamera.takePicture to be stuck because of a memory issue
mCamera.setPreviewCallback(null);
// PictureCallback is implemented by the current class
mCamera.takePicture(null, null, this);
}
@Override
public void onPictureTaken(byte[] data, Camera camera) {
Log.i(TAG, "Saving a bitmap to file");
// The camera preview was automatically stopped. Start it again.
mCamera.startPreview();
mCamera.setPreviewCallback(this);
// Write the image in a file (in jpeg format)
try {
FileOutputStream fos = new FileOutputStream(mPictureFileName);
fos.write(data);
fos.close();
} catch (java.io.IOException e) {
Log.e("PictureDemo", "Exception in photoCallback", e);
}
}
}
我有包括清单文件中所需的权限，例如CAMERA和WRITE_EXTERNAL_STORAGE
I have included the required permissions in the Manifest File such as the CAMERA and the WRITE_EXTERNAL_STORAGE
有人可以确定问题吗？需要你的帮助。在此先感谢！
Can someone determine the problem? Need your help. Thanks in advance!
推荐答案
onTouch（）方法获取每个触摸事件从未标记为已处理的基础视图。如果 Version2CameraView 未处理触摸事件，则会在Activity中处理它们，并且 Version2CameraView 将作为<$ c传递$ c>查看v 参数。
onTouch() method gets every touch event from underlying view that hasn't been marked as "processed". If your Version2CameraView doesn't handle touch events, they are processed in Activity and your Version2CameraView is passed as View v parameter.
不幸的是，您的 JavaCameraView 不会覆盖 performClick（），但你正试着在这个视图上调用它。解？将此方法添加到 Version2CameraView 类：
Unfortunately, your JavaCameraView doesn't override performClick(), but you're trying call it on this view. Solution? Add this method to your Version2CameraView class:
@Override
public boolean performClick() {
// do what you want
return true;
}
这篇关于自定义视图已调用setOnTouchListener，但不会覆盖performClick（类扩展Activity NOT View）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
