• Android ListView item 点击事件失效问题的解决

    关于ListView点击无效,item无法相应点击事件的问题,网上有很多, 大致可分为俩种情况, 一种是 item中存在 ImageButton 等可以点击的组件,这会抢先获得ListView的焦点. 从而导致item点击失效......等等网上好多,不过今天我记录的是另一种情况, 就是ListView中只有TextView 其他什么都没有 ,还失效的情况, 用网上的两种常见的方法,都无济于事.

    经过几番的测试, 发现是在适配器的getView中处理TextView的时候,调用了适配器的notifyDataSetChanged. 在notifyDataSetChanged之后导致item失去焦点.

    之前,碰到过类似的问题, 就是由于在对话框中调用了适配器更新方法notifyDataSetChanged导致Activity失去焦点,影响屏蔽物理返回键的效果.  至于这个notifyDataSetChanged更新以后,哪个组件获得了焦点.还没有研究.先记录下,研究以后在补充这文章.

    下面是摘自网络的相关点击item失效问题的解决方法.仅供参考.

    最近有人问我，在Android里：

    在自定义listView里面有按钮，然后setItemClickListener时不响应，网上很多关于这个的，但我都试过，貌似都解决不了。
    其实刚开始学Android接触ListView时我也遇到此问题，在网上到处搜也难以找到相关解决方案，原因之一是网上原创文章少，转载居多，很多文章都雷同；原因之二在于自己英语不好，不敢上外文论坛去找。
    后来经过自己的慢慢摸索终于解决了这个问题。
    当朋友问我时，我一番简单讲解加几张代码截图就给他解决问题啦~
    废话不多说，先上源代码：源代码
    代码片段：
    main.xml
    [html] view plaincopyprint?

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    <ListView  
    android:id="@+id/lv_list"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    android:layout_alignParentLeft="true"  
    android:layout_below="@+id/numxback"  
    android:cacheColorHint="#00000000"  
    android:drawSelectorOnTop="false"  
    android:fadingEdge="none"  
    android:fastScrollEnabled="true"  
    android:focusable="false"  
    android:divider="@null"  
    android:focusableInTouchMode="true"  
    android:listSelector="@drawable/itemselected" />  



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    <ListView
    android:id="@+id/lv_list"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_alignParentLeft="true"
    android:layout_below="@+id/numxback"
    android:cacheColorHint="#00000000"
    android:drawSelectorOnTop="false"
    android:fadingEdge="none"
    android:fastScrollEnabled="true"
    android:focusable="false"
    android:divider="@null"
    android:focusableInTouchMode="true"
    android:listSelector="@drawable/itemselected" />

    在main布局里加入了一个列表控件，ListView，它的各个属性在此处不是重点，这里就不多说，看不懂的读者自己去网上搜吧！
    datalist.xml
    [html] view plaincopyprint?
    <?xml version="1.0" encoding="utf-8"?>

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    <TextView  
    android:id="@+id/tv_num"  
    android:layout_width="wrap_content"  
    android:layout_height="60px"  
    android:layout_centerVertical="true"  
    android:background="@drawable/number"  
    android:gravity="center"  
    android:paddingLeft="5px"  
    android:paddingRight="8px"  
    android:textColor="@android:color/white"  
    android:textSize="24sp" />  

<ImageButton  
    android:id="@+id/ib_edit"  
    android:layout_width="60px"  
    android:layout_height="60px"  
    android:layout_alignParentRight="true"  
    android:background="@drawable/edit"  
    <SPAN style="COLOR: #ff0000">android:onClick="OnItemEditClick"

    android:paddingRight="5px" />

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    <TextView  
    android:id="@+id/tv_numx"  
    android:layout_width="150px"  
    android:layout_height="60px"  
    android:layout_toRightOf="@+id/tv_num"  
    android:background="@drawable/number"  
    android:gravity="center_vertical"  
    android:singleLine="true"  
    android:textColor="@android:color/white"  
    android:textSize="24sp" />  

<TextView  
    android:id="@+id/tv_numy"  
    android:layout_width="150px"  
    android:layout_height="60px"  
    android:layout_toRightOf="@id/tv_numx"  
    android:layout_toLeftOf="@id/ib_edit"  
    android:background="@drawable/number"  
    android:gravity="center_vertical"  
    android:singleLine="true"  
    android:textColor="@android:color/white"  
    android:textSize="24sp" />



    <?xml version="1.0" encoding="utf-8"?>

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    <TextView
    android:id="@+id/tv_num"
    android:layout_width="wrap_content"
    android:layout_height="60px"
    android:layout_centerVertical="true"
    android:background="@drawable/number"
    android:gravity="center"
    android:paddingLeft="5px"
    android:paddingRight="8px"
    android:textColor="@android:color/white"
    android:textSize="24sp" />

<ImageButton
    android:id="@+id/ib_edit"
    android:layout_width="60px"
    android:layout_height="60px"
    android:layout_alignParentRight="true"
    android:background="@drawable/edit"
    android:onClick="OnItemEditClick"
    android:paddingRight="5px" />

<TextView
    android:id="@+id/tv_numx"
    android:layout_width="150px"
    android:layout_height="60px"
    android:layout_toRightOf="@+id/tv_num"
    android:background="@drawable/number"
    android:gravity="center_vertical"
    android:singleLine="true"
    android:textColor="@android:color/white"
    android:textSize="24sp" />

<TextView
    android:id="@+id/tv_numy"
    android:layout_width="150px"
    android:layout_height="60px"
    android:layout_toRightOf="@id/tv_numx"
    android:layout_toLeftOf="@id/ib_edit"
    android:background="@drawable/number"
    android:gravity="center_vertical"
    android:singleLine="true"
    android:textColor="@android:color/white"
    android:textSize="24sp" />

    列表控件单项布局，在里面加入了三个TextView，一个ImageButton，显示时三个TextView 在前面，最后一个ImageButton。
    之前说到的按钮点击事件在Activity里用button.setOnClickListener的方式实现时会屏蔽/占用ListView单项单击事件，这里就在布局里加了一个android:onClick="OnItemEditClick"，用于绑定按钮点击事件，然后在java代码中实现这个方法，记得须有一个View类型的参数。
    MainActivity.java
    [java] view plaincopyprint?
    package com.test.customlistview;

    import java.util.ArrayList;

    import java.util.HashMap;

    import android.os.Bundle;

    import android.os.Handler;

    import android.os.Message;

    import android.app.Activity;

    import android.app.AlertDialog;

    import android.content.DialogInterface;

    import android.content.DialogInterface.OnClickListener;

    import android.view.View;

    import android.widget.AdapterView;

    import android.widget.ImageButton;

    import android.widget.ListView;

    import android.widget.RelativeLayout;

    import android.widget.SimpleAdapter;

    import android.widget.TextView;

    import android.widget.Toast;

    import android.widget.AdapterView.OnItemLongClickListener;

    public class MainActivity extends Activity {

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    ListView dataListView;  
SimpleAdapter listAdapter;  
ArrayList<HashMap<String, Object>> list;  
private int location;  
Handler mHandler = new Handler() {  

    @Override  
    public void handleMessage(Message msg) {  
        if (msg.arg1 == 1) {  

        } else if (msg.arg1 == 2) {  

        } else if (msg.arg1 == 4) {  
            if (msg.what == 1) {  
                dataListView.getChildAt(msg.arg2).setBackgroundResource(  
                        R.drawable.itemback);  
            }  
        }  
        super.handleMessage(msg);  
    }  
};  
@Override  
protected void onCreate(Bundle savedInstanceState) {  
    super.onCreate(savedInstanceState);  
    setContentView(R.layout.main);  
    dataListView = (ListView) findViewById(R.id.lv_list);  
    list = new ArrayList<HashMap<String, Object>>();  
    int count = 20;  
    HashMap<String, Object> map;  
    for (int i = 1; i <= count; i++) {  
        map = new HashMap<String, Object>();  
        map.put("num", i+ "");  
        map.put("a1", "²=");  
        map.put("a2", ""+i*i);  
        list.add(map);  
    }  
    listAdapter = new SimpleAdapter(this, list, R.layout.datalist,  
            new String[] { "num", "a1", "a2" }, new int[] { R.id.tv_num,  
                    R.id.tv_numx, R.id.tv_numy });  
    dataListView.setAdapter(listAdapter);  
    dataListView.setOnItemLongClickListener(new OnItemLongClickListener() {  
        public boolean onItemLongClick(AdapterView<?> arg0, View view,  
                int position, long id) {  
            location = position;  
            final View nowView = (View) view.findViewById(R.id.ib_edit);  
            Toast.makeText(getBaseContext(), "location=" + location, 2000)  
                    .show();  
            OnClickListener listener = new DialogInterface.OnClickListener() {  
                public void onClick(DialogInterface dialog, int which) {  
                    if (which == 0) {  
                        Toast.makeText(getBaseContext(), "编辑", Toast.LENGTH_LONG).show();  
                    } else if (which == 1) {  
                        Toast.makeText(getBaseContext(), "删除", Toast.LENGTH_LONG).show();  
                    }  
                }  
            };  
            dataListView.getChildAt(location).setBackgroundResource(  
                    R.drawable.item_frame);  
            Message message = new Message();  
            message.arg1 = 4;  
            message.arg2 = location;  
            message.what = 1;  
            mHandler.sendMessageDelayed(message, 500);  
            String[] Menu = { "编辑", "删除" };  

            new AlertDialog.Builder(MainActivity.this).setItems(Menu,  
                    listener).show();  
            return false;  
        }  
    });  
}  

public void OnItemEditClick(View v) {  
    RelativeLayout layout = (RelativeLayout) v.getParent();  
    TextView tv1=(TextView)layout.findViewById(R.id.tv_num);  
    TextView tv2=(TextView)layout.findViewById(R.id.tv_numx);  
    TextView tv3=(TextView)layout.findViewById(R.id.tv_numy);  
    ImageButton ib=(ImageButton)layout.findViewById(R.id.ib_edit);  
    String str="按钮"+tv1.getText()+"点击啦n"+tv1.getText()+tv2.getText()+tv3.getText();  
    Toast.makeText(getBaseContext(), str, Toast.LENGTH_LONG).show();  
}

    }

    package com.test.customlistview;

    import java.util.ArrayList;
    import java.util.HashMap;

    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Message;
    import android.app.Activity;
    import android.app.AlertDialog;
    import android.content.DialogInterface;
    import android.content.DialogInterface.OnClickListener;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.ImageButton;
    import android.widget.ListView;
    import android.widget.RelativeLayout;
    import android.widget.SimpleAdapter;
    import android.widget.TextView;
    import android.widget.Toast;
    import android.widget.AdapterView.OnItemLongClickListener;

    public class MainActivity extends Activity {

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    ListView dataListView;
SimpleAdapter listAdapter;
ArrayList<HashMap<String, Object>> list;
private int location;
Handler mHandler = new Handler() {

    @Override
    public void handleMessage(Message msg) {
        if (msg.arg1 == 1) {

        } else if (msg.arg1 == 2) {

        } else if (msg.arg1 == 4) {
            if (msg.what == 1) {
                dataListView.getChildAt(msg.arg2).setBackgroundResource(
                        R.drawable.itemback);
            }
        }
        super.handleMessage(msg);
    }
};
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    dataListView = (ListView) findViewById(R.id.lv_list);
    list = new ArrayList<HashMap<String, Object>>();
    int count = 20;
    HashMap<String, Object> map;
    for (int i = 1; i <= count; i++) {
        map = new HashMap<String, Object>();
        map.put("num", i+ "");
        map.put("a1", "²=");
        map.put("a2", ""+i*i);
        list.add(map);
    }
    listAdapter = new SimpleAdapter(this, list, R.layout.datalist,
            new String[] { "num", "a1", "a2" }, new int[] { R.id.tv_num,
                    R.id.tv_numx, R.id.tv_numy });
    dataListView.setAdapter(listAdapter);
    dataListView.setOnItemLongClickListener(new OnItemLongClickListener() {
        public boolean onItemLongClick(AdapterView<?> arg0, View view,
                int position, long id) {
            location = position;
            final View nowView = (View) view.findViewById(R.id.ib_edit);
            Toast.makeText(getBaseContext(), "location=" + location, 2000)
                    .show();
            OnClickListener listener = new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    if (which == 0) {
                        Toast.makeText(getBaseContext(), "编辑", Toast.LENGTH_LONG).show();
                    } else if (which == 1) {
                        Toast.makeText(getBaseContext(), "删除", Toast.LENGTH_LONG).show();
                    }
                }
            };
            dataListView.getChildAt(location).setBackgroundResource(
                    R.drawable.item_frame);
            Message message = new Message();
            message.arg1 = 4;
            message.arg2 = location;
            message.what = 1;
            mHandler.sendMessageDelayed(message, 500);
            String[] Menu = { "编辑", "删除" };

            new AlertDialog.Builder(MainActivity.this).setItems(Menu,
                    listener).show();
            return false;
        }
    });
}

public void OnItemEditClick(View v) {
    RelativeLayout layout = (RelativeLayout) v.getParent();
    TextView tv1=(TextView)layout.findViewById(R.id.tv_num);
    TextView tv2=(TextView)layout.findViewById(R.id.tv_numx);
    TextView tv3=(TextView)layout.findViewById(R.id.tv_numy);
    ImageButton ib=(ImageButton)layout.findViewById(R.id.ib_edit);
    String str="按钮"+tv1.getText()+"点击啦n"+tv1.getText()+tv2.getText()+tv3.getText();
    Toast.makeText(getBaseContext(), str, Toast.LENGTH_LONG).show();
}

    }
    OnItemEditClick(View v)方法中通过v.getParent();找到她的容器控件，前面的(RelativeLayout)根据你自己的布局里的容器控件而定。然后即可使用该容器控件找到他的所有自控件，然后读者想干嘛就干嘛啦~
    上面的dataListView.setOnItemLongClickListener实现ListView的item长按事件，我在这里加了一个显示两条菜单的对话框，用于进行其他操作，如编辑、删除等。
    这里也可以实现ListView的点击事件，PS：这段代码是后来加的，直接嵌入源代码中即可，已调试无误。

    [java] view plaincopyprint?
    dataListView.setOnItemClickListener(new OnItemClickListener() {

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            @Override  
        public void onItemClick(AdapterView<?> arg0, View view, int arg2,  
                long arg3) {  
            TextView tv=(TextView)view.findViewById(R.id.tv_num);  
            Toast.makeText(getBaseContext(), "您点击了第" + tv.getText()+"行", 2000).show();  
        }  
    });

    dataListView.setOnItemClickListener(new OnItemClickListener() {

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            @Override
        public void onItemClick(AdapterView<?> arg0, View view, int arg2,
                long arg3) {
            TextView tv=(TextView)view.findViewById(R.id.tv_num);
            Toast.makeText(getBaseContext(), "您点击了第" + tv.getText()+"行", 2000).show();
        }
    });修改后的MainActivity.java代码如下

    [java] view plaincopyprint?
    package com.test.customlistview;

    import java.util.ArrayList;

    import java.util.HashMap;

    import android.os.Bundle;

    import android.os.Handler;

    import android.os.Message;

    import android.app.Activity;

    import android.app.AlertDialog;

    import android.content.DialogInterface;

    import android.content.DialogInterface.OnClickListener;

    import android.view.View;

    import android.widget.AdapterView;

    import android.widget.AdapterView.OnItemClickListener;

    import android.widget.ImageButton;

    import android.widget.ListView;

    import android.widget.RelativeLayout;

    import android.widget.SimpleAdapter;

    import android.widget.TextView;

    import android.widget.Toast;

    import android.widget.AdapterView.OnItemLongClickListener;

    public class MainActivity extends Activity {

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    ListView dataListView;  
SimpleAdapter listAdapter;  
ArrayList<HashMap<String, Object>> list;  
private int location;  
Handler mHandler = new Handler() {  

    @Override  
    public void handleMessage(Message msg) {  
        if (msg.arg1 == 1) {  

        } else if (msg.arg1 == 2) {  

        } else if (msg.arg1 == 4) {  
            if (msg.what == 1) {  
                dataListView.getChildAt(msg.arg2).setBackgroundResource(  
                        R.drawable.itemback);  
            }  
        }  
        super.handleMessage(msg);  
    }  
};  
@Override  
protected void onCreate(Bundle savedInstanceState) {  
    super.onCreate(savedInstanceState);  
    setContentView(R.layout.main);  
    dataListView = (ListView) findViewById(R.id.lv_list);  
    list = new ArrayList<HashMap<String, Object>>();  
    int count = 20;  
    HashMap<String, Object> map;  
    for (int i = 1; i <= count; i++) {  
        map = new HashMap<String, Object>();  
        map.put("num", i+ "");  
        map.put("a1", "²=");  
        map.put("a2", ""+i*i);  
        list.add(map);  
    }  
    listAdapter = new SimpleAdapter(this, list, R.layout.datalist,  
            new String[] { "num", "a1", "a2" }, new int[] { R.id.tv_num,  
                    R.id.tv_numx, R.id.tv_numy });  
    dataListView.setAdapter(listAdapter);  
    dataListView.setOnItemClickListener(new OnItemClickListener() {  

        @Override  
        public void onItemClick(AdapterView<?> arg0, View view, int arg2,  
                long arg3) {  
            TextView tv=(TextView)view.findViewById(R.id.tv_num);  
            Toast.makeText(getBaseContext(), "您点击了第" + tv.getText()+"行", 2000).show();  
        }  
    });  
    dataListView.setOnItemLongClickListener(new OnItemLongClickListener() {  
        public boolean onItemLongClick(AdapterView<?> arg0, View view,  
                int position, long id) {  
            location = position;  
            final View nowView = (View) view.findViewById(R.id.ib_edit);  
            Toast.makeText(getBaseContext(), "location=" + location, 2000)  
                    .show();  
            OnClickListener listener = new DialogInterface.OnClickListener() {  
                public void onClick(DialogInterface dialog, int which) {  
                    if (which == 0) {  
                        Toast.makeText(getBaseContext(), "编辑", Toast.LENGTH_LONG).show();  
                    } else if (which == 1) {  
                        Toast.makeText(getBaseContext(), "删除", Toast.LENGTH_LONG).show();  
                    }  
                }  
            };  
            dataListView.getChildAt(location).setBackgroundResource(  
                    R.drawable.item_frame);  
            Message message = new Message();  
            message.arg1 = 4;  
            message.arg2 = location;  
            message.what = 1;  
            mHandler.sendMessageDelayed(message, 500);  
            String[] Menu = { "编辑", "删除" };  

            new AlertDialog.Builder(MainActivity.this).setItems(Menu,  
                    listener).show();  
            return false;  
        }  
    });  
}  

public void OnItemEditClick(View v) {  
    RelativeLayout layout = (RelativeLayout) v.getParent();  
    TextView tv1=(TextView)layout.findViewById(R.id.tv_num);  
    TextView tv2=(TextView)layout.findViewById(R.id.tv_numx);  
    TextView tv3=(TextView)layout.findViewById(R.id.tv_numy);  
    ImageButton ib=(ImageButton)layout.findViewById(R.id.ib_edit);  
    String str="按钮"+tv1.getText()+"点击啦n"+tv1.getText()+tv2.getText()+tv3.getText();  
    Toast.makeText(getBaseContext(), str, Toast.LENGTH_LONG).show();  
}

    }

    package com.test.customlistview;

    import java.util.ArrayList;
    import java.util.HashMap;

    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Message;
    import android.app.Activity;
    import android.app.AlertDialog;
    import android.content.DialogInterface;
    import android.content.DialogInterface.OnClickListener;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.AdapterView.OnItemClickListener;
    import android.widget.ImageButton;
    import android.widget.ListView;
    import android.widget.RelativeLayout;
    import android.widget.SimpleAdapter;
    import android.widget.TextView;
    import android.widget.Toast;
    import android.widget.AdapterView.OnItemLongClickListener;

    public class MainActivity extends Activity {

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    ListView dataListView;
SimpleAdapter listAdapter;
ArrayList<HashMap<String, Object>> list;
private int location;
Handler mHandler = new Handler() {

    @Override
    public void handleMessage(Message msg) {
        if (msg.arg1 == 1) {

        } else if (msg.arg1 == 2) {

        } else if (msg.arg1 == 4) {
            if (msg.what == 1) {
                dataListView.getChildAt(msg.arg2).setBackgroundResource(
                        R.drawable.itemback);
            }
        }
        super.handleMessage(msg);
    }
};
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    dataListView = (ListView) findViewById(R.id.lv_list);
    list = new ArrayList<HashMap<String, Object>>();
    int count = 20;
    HashMap<String, Object> map;
    for (int i = 1; i <= count; i++) {
        map = new HashMap<String, Object>();
        map.put("num", i+ "");
        map.put("a1", "²=");
        map.put("a2", ""+i*i);
        list.add(map);
    }
    listAdapter = new SimpleAdapter(this, list, R.layout.datalist,
            new String[] { "num", "a1", "a2" }, new int[] { R.id.tv_num,
                    R.id.tv_numx, R.id.tv_numy });
    dataListView.setAdapter(listAdapter);
    dataListView.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View view, int arg2,
                long arg3) {
            TextView tv=(TextView)view.findViewById(R.id.tv_num);
            Toast.makeText(getBaseContext(), "您点击了第" + tv.getText()+"行", 2000).show();
        }
    });
    dataListView.setOnItemLongClickListener(new OnItemLongClickListener() {
        public boolean onItemLongClick(AdapterView<?> arg0, View view,
                int position, long id) {
            location = position;
            final View nowView = (View) view.findViewById(R.id.ib_edit);
            Toast.makeText(getBaseContext(), "location=" + location, 2000)
                    .show();
            OnClickListener listener = new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    if (which == 0) {
                        Toast.makeText(getBaseContext(), "编辑", Toast.LENGTH_LONG).show();
                    } else if (which == 1) {
                        Toast.makeText(getBaseContext(), "删除", Toast.LENGTH_LONG).show();
                    }
                }
            };
            dataListView.getChildAt(location).setBackgroundResource(
                    R.drawable.item_frame);
            Message message = new Message();
            message.arg1 = 4;
            message.arg2 = location;
            message.what = 1;
            mHandler.sendMessageDelayed(message, 500);
            String[] Menu = { "编辑", "删除" };

            new AlertDialog.Builder(MainActivity.this).setItems(Menu,
                    listener).show();
            return false;
        }
    });
}

public void OnItemEditClick(View v) {
    RelativeLayout layout = (RelativeLayout) v.getParent();
    TextView tv1=(TextView)layout.findViewById(R.id.tv_num);
    TextView tv2=(TextView)layout.findViewById(R.id.tv_numx);
    TextView tv3=(TextView)layout.findViewById(R.id.tv_numy);
    ImageButton ib=(ImageButton)layout.findViewById(R.id.ib_edit);
    String str="按钮"+tv1.getText()+"点击啦n"+tv1.getText()+tv2.getText()+tv3.getText();
    Toast.makeText(getBaseContext(), str, Toast.LENGTH_LONG).show();
}

    }
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  • 原文地址：https://www.cnblogs.com/aikongmeng/p/3697311.html
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