Question

我有一个ListView，当你点击一个项目时，我想检查该项目是在左侧还是右侧点击。这是我的代码：

package com.testapp.toroco;

import android.support.v4.app.ListFragment;
import android.graphics.Point;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.Display;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class FragmentA extends ListFragment implements OnClickListener {

int width;
public void onCreate(Bundle b) {
    super.onCreate(b);
    getSize();
}
public void getSize(){
    Display display = getActivity().getWindowManager().getDefaultDisplay();
    Point size = new Point();
    display.getSize(size);
    width = size.x;
}

@Override
  public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    String[] itemlist = {"A","b","C","d","E","f"};
    ArrayAdapter<String> adapter = new ArrayAdapter<String>  (getActivity(),R.layout.layoutrow,R.id.name,itemlist);
    setListAdapter(adapter);
  }
@Override
  public void onListItemClick(ListView l, View v, int position, long id) {
    // do something with the data
  }
public boolean dispatchTouchEvent(MotionEvent event) {
    int actionX = (int) event.getX();

int middlePoint = width/2 ; 

if(actionX >middlePoint ){
    Log.d("Touch", "Right");
}else if (actionX <middlePoint ){
    Log.d("Touch", "Left");
}

                return false;
}
@Override
public void onClick(View v) {
    // TODO Auto-generated method stub

}
}

我知道我没有正确添加监听器，并且onListItemClick和dispatchTouchEvent当前是两个单独的事件。但不幸的是，我现在已经知道如何实现这一目标。有没有更好的方法来找出它被点击的哪一半？如果没有，我必须在哪个View上注册ClickListener，如何创建一个事件（onListItemClick和dispatchTouchEvent）检查另一个事件的结果？

非常感谢你的帮助！

Answer 1

Tweek！您可以使用自定义布局创建自定义列表视图，您可以在其中向左侧和右侧添加两个视图，为这两个视图添加setOnClickListeners（）。

修改

我给你一个如何做的例子。

为列表项创建xml布局：listItem.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:weightSum="1" > <LinearLayout android:id="@+id/leftPart" android:layout_width="0dip" android:layout_height="10dp" android:orientation="vertical" android:layout_weight="0.5" android:background="#ff0000" > </LinearLayout> <LinearLayout android:id="@+id/rightPart" android:layout_width="0dip" android:layout_height="10dp" android:orientation="vertical" android:layout_weight="0.5" android:background="#00ff00" > </LinearLayout> </LinearLayout>

为listView编写自定义适配器：CustomListAdapter.java

public class CustomListAdapter extends ArrayAdapter<String> { int resource; // change String to your required datatype public CustomListAdapter(Context context, int resource, int textViewResourceId, String[] objects) { super(context, resource, textViewResourceId, objects); this.resource = resource; // TODO Auto-generated constructor stub } @Override public View getView(int position, View convertView, ViewGroup parent) { if (convertView == null) { convertView = LayoutInflater.from(getContext()).inflate(resource, parent, false); } final int pos = position; convertView.findViewById(R.id.leftPart).setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // Do your work here Toast.makeText(getContext(), "Left Side of " + pos + "th element clicked", Toast.LENGTH_SHORT).show(); } }); convertView.findViewById(R.id.rightPart).setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // Do your work here Toast.makeText(getContext(), "Right Side of " + pos + "th element clicked", Toast.LENGTH_SHORT).show(); } }); return convertView; } }

将适配器设置为ListView，如下所示，

yourListView.setAdapter(getActivity(),R.id.listItem, /*your data*/);

我还没有测试过这段代码，但这应该可行。

Answer 2

在dispatchTouchEvent方法中：

public boolean dispatchTouchEvent(MotionEvent event) {

   switch(event.getAction())
            {
            case MotionEvent.ACTION_DOWN:

                x1 = event.getX();
                y1 = event.getY();
                System.out.println("x1-- "+x1);
                System.out.println("y1-- "+y1);
                dx = x1 - y1 ;
                break ;

            case MotionEvent.ACTION_UP:

                x2 = event.getX();
                y2 = event.getY();
                System.out.println("x2-- "+x2);
                System.out.println("y2-- "+y2);
                dy = x2 - y2 ;

            }


             if(dx > 1)
                {
                    System.out.println(" clicked on right side ");

                }else 
                {
                    System.out.println(" clicked on left side ");

                }

            return false;
}

ListView单击左侧或右侧

2 个答案: