Android 之 ListView 点击响应代码？

Posted 2020-06-14

ListView 点击响应代码(如下)，以前都是正确的：

1 private class MusicListItemClickListener implements OnItemClickListener {  
2   
3   
4     @Override  
5     public void onItemClick(AdapterView<?> parent, View view, int position,long id) {  
6     }  
7 }  

可参阅以前的一博文：http://blog.csdn.net/91program/article/details/39232721

在新的工程使用时，先提示 onItemClick 需要删除 @Override。我直接将 onItemClick 删除，再自动增加函数时，发现自动增加的函数变成如下所示的，参数的参数发生了变化，特别是第一个参数，由 AdapterView 变成 AdapterViewCompat。代码不再提示错误，运行之！

 1 private class contactsListItemClickListener implements OnItemClickListener {        // AdapterViewCompat.OnItemClickListener  
 2     @Override  
 3     public void onItemClick(AdapterViewCompat<?> arg0, View arg1, int arg2,  
 4             long arg3) {  
 5         // TODO Auto-generated method stub  
 6         int position = arg2;  
 7         int id = (int) arg3;  
 8         Log.i(phoneBookInfo.TAG, "position: " + Integer.toString(position) + " id: " + Integer.toString(id));  
 9     }  
10 }  

运行时出现错误。提示如下：

D/androidRuntime(19395): Shutting down VM  
 W/dalvikvm(19395): threadid=1: thread exiting with uncaught exception (group=0x4001b6a8)  
 E/AndroidRuntime(19395): FATAL EXCEPTION: main  
 E/AndroidRuntime(19395): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.hs.leozheng.backuprecords/com.hs.leozheng.backuprecords.MainActivity}: java.lang.ClassCastException: com.hs.leozheng.backuprecords.MainActivity$contactsListItemClickListener  
 E/AndroidRuntime(19395):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1734)  
 E/AndroidRuntime(19395):   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1753)  
 E/AndroidRuntime(19395):   at android.app.ActivityThread.access$1500(ActivityThread.java:155)  
 E/AndroidRuntime(19395):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:999)  
 E/AndroidRuntime(19395):   at android.os.Handler.dispatchMessage(Handler.java:130)  
 E/AndroidRuntime(19395):   at android.os.Looper.loop(SourceFile:351)  
 E/AndroidRuntime(19395):   at android.app.ActivityThread.main(ActivityThread.java:3820)  
 E/AndroidRuntime(19395):   at java.lang.reflect.Method.invokeNative(Native Method)  
 E/AndroidRuntime(19395):   at java.lang.reflect.Method.invoke(Method.java:538)  
 E/AndroidRuntime(19395):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:969)  
 E/AndroidRuntime(19395):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:727)  
 E/AndroidRuntime(19395):   at dalvik.system.NativeStart.main(Native Method)  
 E/AndroidRuntime(19395): Caused by: java.lang.ClassCastException: com.hs.leozheng.backuprecords.MainActivity$contactsListItemClickListener  
 E/AndroidRuntime(19395):   at com.hs.leozheng.backuprecords.MainActivity.findViews(MainActivity.java:140)  
 E/AndroidRuntime(19395):   at com.hs.leozheng.backuprecords.MainActivity.onCreate(MainActivity.java:57)  
 E/AndroidRuntime(19395):   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1082)  
 E/AndroidRuntime(19395):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1698)  
 E/AndroidRuntime(19395):   ... 11 more  

对比之前的代码，与现在的代码，发现可能是 AdapterViewCompat 引起的。所以强制将 OnItemClickListener 声明为 AdapterView 的成员，如下：

1 private class contactsListItemClickListener implements AdapterView.OnItemClickListener {  
2     @Override  
3     public void onItemClick(AdapterView<?> parent, View view, int position,  
4             long id) {  
5         // TODO Auto-generated method stub  
6         Log.i(phoneBookInfo.TAG, "position: " + Integer.toString(position) + " id: " + Long.toString(id));  
7     }  
8 }  

这样自动增加的 onItemClick 函数终于和以前一样了。
运行之，正确！