Question

我无法启动新活动，点击列表视图中的项目。我希望onItemClick可以打开ApkInfoActivity。实际上当我点击什么都没有发生时。

protected void onItemClick(ListView l, View v, int position, long id, AdapterView<?> parent) {
        super.onListItemClick(l, v, position, id);

       final ApplicationInfo app = applist.get(position);

       PackageInfo packageInfo = (PackageInfo) parent.getItemAtPosition(position);

       AppDataActivity appData = (AppDataActivity) getApplicationContext();
       appData.setPackageInfo(packageInfo);

       Intent appInfo = new Intent(getApplicationContext(), ApkInfoActivity.class);
       startActivity(appInfo);

    }

我找不到问题。我怎么解决？

使用logcat编辑：

10-29 17:14:07.710: E/AndroidRuntime(3535): FATAL EXCEPTION: main
10-29 17:14:07.710: E/AndroidRuntime(3535): java.lang.ClassCastException: android.content.pm.ApplicationInfo cannot be cast to android.content.pm.PackageInfo
10-29 17:14:07.710: E/AndroidRuntime(3535):     at com.dd.application.MainActivity.onItemClick(MainActivity.java:369)
10-29 17:14:07.710: E/AndroidRuntime(3535):     at android.widget.AdapterView.performItemClick(AdapterView.java:297)
10-29 17:14:07.710: E/AndroidRuntime(3535):     at android.widget.AbsListView.performItemClick(AbsListView.java:1149)
10-29 17:14:07.710: E/AndroidRuntime(3535):     at android.widget.AbsListView$PerformClick.run(AbsListView.java:2939)
10-29 17:14:07.710: E/AndroidRuntime(3535):     at android.widget.AbsListView$2.run(AbsListView.java:3622)
10-29 17:14:07.710: E/AndroidRuntime(3535):     at android.os.Handler.handleCallback(Handler.java:730)
10-29 17:14:07.710: E/AndroidRuntime(3535):     at android.os.Handler.dispatchMessage(Handler.java:92)
10-29 17:14:07.710: E/AndroidRuntime(3535):     at android.os.Looper.loop(Looper.java:137)
10-29 17:14:07.710: E/AndroidRuntime(3535):     at android.app.ActivityThread.main(ActivityThread.java:5323)
10-29 17:14:07.710: E/AndroidRuntime(3535):     at java.lang.reflect.Method.invokeNative(Native Method)
10-29 17:14:07.710: E/AndroidRuntime(3535):     at java.lang.reflect.Method.invoke(Method.java:525)
10-29 17:14:07.710: E/AndroidRuntime(3535):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:743)
10-29 17:14:07.710: E/AndroidRuntime(3535):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:559)
10-29 17:14:07.710: E/AndroidRuntime(3535):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

用它来做你的工作

 list.setOnItemClickListener(new AdapterView.onItemClickListener() {
   @Override
   public void onItemClick(AdapterView<?> adapter, View view, int position, long arg) {
      Intent appInfo = new Intent(YourActivity.this, ApkInfoActivity.class);
       startActivity(appInfo);
   } 
});

Answer 2

public class MenuYangu extends ListActivity {

String classes[] = { "Quiz Trivia", "Sign A New User", "Friend List",
"Download A File", "Upload A File", "Select Pdf files", "Memory Game",
"Dzidza Maths", "Write Exam" };

@Override
protected void onCreate(Bundle savedInstanceState) 
{
   // TODO Auto-generated method stub
   super.onCreate(savedInstanceState);
   setListAdapter(new ArrayAdapter<String>(Menuone.this,
   android.R.layout.simple_list_item_1, classes));

}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) 
{
     // TODO Auto-generated method stub
     super.onListItemClick(l, v, position, id);

if (position == 0) {
Intent intent = new Intent(this, QuizActivity.class);
startActivity(intent);
}
else if (position == 1) {
Intent intent = new Intent(this, SignUp.class);
startActivity(intent);
}
 else if (position == 2) {
 Intent intent = new Intent(this, FriendList.class);
 startActivity(intent);
 } 
 }

 }

 }

Answer 3

您需要使用Intent，您还可以将点击的listview项数据传递给新活动。

String classes[] = { "Quiz Trivia", "Sign A New User", "Friend List",
"Download A File", "Upload A File", "Select Pdf files", "Memory Game",
"Dzidza Maths", "Write Exam" };

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {                   
Intent intent = new Intent(getApplicationContext(),ApkInfoActivity.class);
                intent.putExtra("name",classes[i]);
                startActivity(intent);


        }
    });

}

输出：

您可以找到整个教程here

Answer 4

为Listview添加setOnItemclickListener（）。

Answer 5

使用此：

Intent appInfo = new Intent(CurrentActivity.this, ApkInfoActivity.class); startActivity(appInfo);

Answer 6

尝试将方法标题从protected更改为public。

修改

现在我看一下，你的方法标题实际上是错误的。它应该如下：

public abstract void onItemClick (AdapterView<?> parent, View view, int position, long id)

变量必须与它们实现的接口中的变量顺序相同。

Answer 7

例如，如果你想打开一个基于文本的活动你点击列表视图，即如果“abcd”是点击列表视图的选项，你想打开同名“abcd”的活动，那么执行此.. ..

public void onItemClick(AdapterView<?> parent, View view, int position,
        long id) {

    String temp=yourarray[position];


    try{
        Class myclass=Class.forName("yourpackagename."+temp);
        Intent in=new Intent(this,myclass);
        startActivity(in);
        }catch(Exception e){

        }


}

Answer 8

解释我的答案。我假设您已按照发布的代码顺序设置列表视图。我只会查看您的代码的这一部分： super.onListItemClick（l，v，position，id）; 我不这是必要的。在我给出的例子的情况下：

lv.setOnItemClickListener(new OnItemClickListener() {
  @Override
  public void onItemClick(AdapterView<?> adapter, View view, int position, long arg) {
      if(position==0){
     Intent appInfo = new Intent(SwahiliService.this, DisplayActivity.class);
      startActivity(appInfo);
  } 
      if(position==1){
          Intent english=new Intent(SwahiliService.this,EnglishService.class);
          startActivity(english);
      }
      if(position==2){
          Toast.makeText(getApplicationContext(),"You have selected pst3", Toast.LENGTH_LONG).show();
      }

我只是在列表视图中设置一个lister，我称之为lv，我的适配器（我的listview项的持有者）设置了三个变量，一个是View，int是位置，long是参数：我指的是列表视图中选择的项目，其位置通常从0开始（尽管您可以将其实例化为任何其他数字，因为您希望e，g int position = 1，将项目计数开始为1）。从这里你可以使用任何控件结构来按照单击的项目启动活动，在我的情况下，我使用了for循环，因为我假设我的listview只有三个项目，对于更大的listview项目，你可以使用for循环。请注意我如何通过首先引用当前活动来开始我的新活动，如下所示（SwahiliService.this）可以安全地替换为（仅此关键字），然后遵循我想要开始的活动。我希望现在更加精细。

Answer 9

//添加ArrayList和ArrayAdapter：

    final ArrayList<String> listItems = new ArrayList<String>();
        listItems.add("image_one");
        listItems.add("image_two");
        listItems.add("image_three");

    ArrayAdapter<String> myArrayAdapter = new ArrayAdapter<>(this, 
        android.R.layout.simple_list_item_1, listItems);
        myListView.setAdapter(myArrayAdapter);

//添加类的ArrayList ：

    final ArrayList<Class> intents = new ArrayList<Class>();
        intents.add(image_one.class);
        intents.add(image_two.class);
        intents.add(image_three.class);

//单击列表项以从类的ArrayList ：

打开类

    myListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int 
        position, long id) {

            Intent listIntent = new Intent(getApplicationContext(), 
            intents.get(position)); 
            startActivity(listIntent);
        }
    });

SEE IMAGE OF CLASS NAMES HERE

Answer 10

    lv.setOnItemClickListener(new OnItemClickListener() {
      @Override
      public void onItemClick(AdapterView<?> adapter, View view, int position, long arg) {
          if(position==0){
         Intent appInfo = new Intent(SwahiliService.this, DisplayActivity.class);
          startActivity(appInfo);
      } 
          if(position==1){
              Intent english=new Intent(SwahiliService.this,EnglishService.class);
              startActivity(english);
          }
          if(position==2){
              Toast.makeText(getApplicationContext(),"You have selected pst3", Toast.LENGTH_LONG).show();
          }
   }});

如何打开新活动点击列表视图中的项目？

10 个答案: