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" />
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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"
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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" />
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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"
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" />
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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
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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();
}
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}
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();
}
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}
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();
}
});
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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
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[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();
}
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}
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();
}
|
}