Java 自定义视图已调用setOnTouchListener,但未重写performClick(类扩展活动而不是视图)
我创建了一个Android活动,实现了一点OpenCV。它所做的只是创建一个自定义的相机视图,当触摸屏幕时,照片将被保存 我唯一的问题是代码Java 自定义视图已调用setOnTouchListener,但未重写performClick(类扩展活动而不是视图),java,android,opencv,Java,Android,Opencv,我创建了一个Android活动,实现了一点OpenCV。它所做的只是创建一个自定义的相机视图,当触摸屏幕时,照片将被保存 我唯一的问题是代码mOpenCvCameraView.setOnTouchListener(MainActivity.this)包含警告 mOpenCvCameraView.setOnTouchListener(MainActivity.this)警告 自定义视图com/example/zcameratestv2/Version2CameraView已对其调用setOnTou
mOpenCvCameraView.setOnTouchListener(MainActivity.this)包含警告
mOpenCvCameraView.setOnTouchListener(MainActivity.this)代码>警告
自定义视图com/example/zcameratestv2/Version2CameraView已对其调用setOnTouchListener,但未覆盖performClick
与其他问题不同,我的类扩展了活动而不是视图,因此当我尝试重写函数private boolean performClick(){…super.performClick();}
时,无法识别它。这是我的课
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,公共布尔onTouch(视图v,MotionEvent事件)
事件有一个类似于OnTouchListener的警告,它显示我应该使用performClick();方法,但我无法重写它,因为我扩展到活动
而不是视图
。我发现应用v.PerformClick()代码>修复了这个问题
另一个类处理摄影机进程
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);
}
}
}
我已经在清单文件中包括了所需的权限,如摄像头和写入外部存储
有人能确定这个问题吗?我需要你的帮助。提前谢谢 onTouch()
方法从底层视图获取尚未标记为“已处理”的每个触摸事件。如果您的Version2CameraView
不处理触摸事件,则会在活动中处理这些事件,并且您的Version2CameraView
将作为View v
参数传递
不幸的是,您的JavaCameraView
没有覆盖performClick()
,但您正在尝试在此视图上调用它。解决方案将此方法添加到Version2CameraView
类:
@Override
public boolean performClick() {
// do what you want
return true;
}
您需要添加一个方法来处理触摸事件,因为您的视图已经调用了setOnTouchListener()
,添加对默认方法的覆盖,确保在内部调用super方法以避免类似“方法不覆盖其超类中的方法”这样的错误,如果您不打算在其中处理触摸事件,则可以将其保留为我的示例:
@Override
public boolean performClick() {
super.performClick();
return true;
}
我觉得有点晚了,但解决办法很简单。类,如按钮
,文本视图
是视图
的子类,以及SurfaceView
,后者是JavaCameraView
和Version2CameraView
子类的父类
那有什么区别呢?
区别在于TextView
实现了一个“ViewTreeObserver.OnPreDrawListener”接口。因此,按钮(它是TextView
的子类)可以覆盖performClick()
方法
如何处理我的Version2CameraView
类?
只需实现一个接口来重写performClick()
方法
哪一个,ViewTreeObserver.OnPreDrawListener
?不,您应该像这样使用SurfaceHolder.Callback
:
public class Version2CameraView extends JavaCameraView implements PictureCallback, SurfaceHolder.Callback
{
...
/**
* Process the MotionEvent.
*/
@Override
public boolean onTouchEvent(MotionEvent event) {
synchronized (getHolder()) {
// Do something
...
return true;
}
}
@Override
public boolean performClick() {
// Calls the super implementation, which generates an AccessibilityEvent
// and calls the onClick() listener on the view, if any
super.performClick();
// Handle the action for the custom click here
return true;
}
...
}
此解决方案必须删除您的警告。当我在类中添加performClick函数(如上所述)时,它会显示“方法不会从其超类重写方法”(错误)和“performClick从未使用”。我的类实现了onTouchListener,我使用v.perfumrclick()实现了onTouch函数;在…内我错过了什么?在上次Android Studio更新之前,它运行良好……你找到解决方案了吗?这是谷歌的狗屎。在方法定义之前使用@SuppressLint(“ClickableViewAccessibility”),或创建自定义视图: