Android ListView item 点击事件失效问题的解决

时间：2024-01-05 09:31:02

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

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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

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<?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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