Java 单击从listview中删除所选项目

因此，我有一个listview，我希望当我单击一个按钮时，它确实会从listview中删除所选项目。我的listview在xml文件中的定义如下，这就是它的可选性：

<ListView
        android:id="@+id/listView1"
        android:layout_width="200dp"
        android:layout_height="100dp"
        android:layout_alignLeft="@+id/button2"
        android:layout_below="@+id/textView2"
        android:choiceMode="singleChoice"
        android:background="@drawable/bg_key" > >
    </ListView>

>

---

到目前为止，我的java代码没有错误，但我的应用程序在启动时崩溃：

public class MainActivity extends ListActivity {

    Button button1;
    Button button3;
    Button button2;
    Button button4;
    ListView listView1;
    ListView listView2;
    Spinner s1;
    String text;
    Integer i;
    SparseBooleanArray checkedItemPositions ;


    ArrayAdapter<String> adapter;
    ArrayAdapter<String> adapter2;
    int itemPos;
    ArrayList<String> list = new ArrayList<String>();
    ArrayList<String> list2 = new ArrayList<String>();

     @Override
        protected void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            button1 = (Button) findViewById(R.id.button1);
            button3 = (Button) findViewById(R.id.button3); 
            button4 = (Button) findViewById(R.id.button4); 
            button2 = (Button) findViewById(R.id.button2);
            s1 = (Spinner) findViewById(R.id.spinner1);
            listView1 = (ListView) findViewById(R.id.listView1);
            listView2 = (ListView) findViewById(R.id.listView2);



            adapter = new ArrayAdapter<String>(this,
                    android.R.layout.simple_list_item_single_choice, list);
                listView1.setAdapter(adapter);

                button2.setOnClickListener(new View.OnClickListener() {

                    public void onClick(View v) {

                        String text = s1.getSelectedItem().toString();
                        list.add(text); 
                        adapter.notifyDataSetChanged();



                    }});

                adapter2 = new ArrayAdapter<String>(this,
                        android.R.layout.simple_list_item_single_choice, list2);
                    listView2.setAdapter(adapter2);

                    button1.setOnClickListener(new View.OnClickListener() {

                        public void onClick(View v) {

                            String text = s1.getSelectedItem().toString();
                            list2.add(text); 
                            adapter2.notifyDataSetChanged();



                        }});

                    button3.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            /** Getting the checked items from the listview */
                            SparseBooleanArray checkedItemPositions = getListView().getCheckedItemPositions();


                            for(int i=itemPos-1; i >= 0; i--){
                                if(checkedItemPositions.get(i)){
                                    adapter.remove(list.get(i));
                                }
                            }
                            checkedItemPositions.clear();
                            adapter.notifyDataSetChanged();
                        }
                    });



     listView1.setOnItemClickListener(new OnItemClickListener() {
      @Override
      public void onItemClick(AdapterView<?> parent, View view,
        int position, long id) {

            view.setSelected(true);

        itemPos = position;

      }});
    listView2.setOnItemClickListener(new OnItemClickListener() {
          @Override
          public void onItemClick(AdapterView<?> parent, View view,
            int position, long id) {

                view.setSelected(true);

            itemPos = position;

          }
    });}}

public类MainActivity扩展了ListActivity{
按钮1；
按钮3；
按钮2；
按钮4；
列表视图列表视图1；
ListView listView2；
旋转器s1；
字符串文本；
整数i；
SparseBooleanArray checkedItemPositions；
阵列适配器；
阵列适配器2；
int itemPos；
ArrayList=新建ArrayList（）；
ArrayList list2=新的ArrayList（）；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
button1=（按钮）findViewById（R.id.button1）；
button3=（按钮）findViewById（R.id.button3）；
button4=（按钮）findViewById（R.id.button4）；
button2=（按钮）findViewById（R.id.button2）；
s1=（喷丝器）findViewById（R.id.spinner1）；
listView1=（ListView）findViewById（R.id.listView1）；
listView2=（ListView）findViewById（R.id.listView2）；
适配器=新阵列适配器（此，
android.R.layout.simple_list_item_single_choice，list）；
listView1.setAdapter（适配器）；
button2.setOnClickListener（新视图.OnClickListener（）{
公共void onClick（视图v）{
String text=s1.getSelectedItem（）.toString（）；
列表。添加（文本）；
adapter.notifyDataSetChanged（）；
}});
适配器2=新阵列适配器（此，
android.R.layout.simple_list_item_single_choice，list2）；
listView2.setAdapter（适配器2）；
button1.setOnClickListener（新视图.OnClickListener（）{
公共void onClick（视图v）{
String text=s1.getSelectedItem（）.toString（）；
列表2.添加（文本）；
adapter2.notifyDataSetChanged（）；
}});
button3.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
/**从listview获取选中的项*/
SparseBooleanArray checkEditePositions=getListView（）.GetCheckEditePositions（）；
对于（int i=itemPos-1；i>=0；i--）{
if（checkedItemPositions.get（i））{
adapter.remove（list.get（i））；
}
}
checkedItemPositions.clear（）；
adapter.notifyDataSetChanged（）；
}
});
listView1.setOnItemClickListener（新的OnItemClickListener（）{
@凌驾
public void onItemClick（AdapterView父级、视图、，
内部位置，长id）{
view.setSelected（true）；
itemPos=位置；
}});
listView2.setOnItemClickListener（新的OnItemClickListener（）{
@凌驾
public void onItemClick（AdapterView父级、视图、，
内部位置，长id）{
view.setSelected（true）；
itemPos=位置；
}
});}}

logcat

11-03 13:58:28.496: E/Trace(624): error opening trace file: No such file or directory (2)
11-03 13:58:28.776: D/dalvikvm(624): GC_FOR_ALLOC freed 125K, 3% free 6156K/6343K, paused 41ms, total 43ms
11-03 13:58:28.866: D/dalvikvm(624): GC_FOR_ALLOC freed 1K, 4% free 6498K/6727K, paused 23ms, total 23ms
11-03 13:58:28.926: D/dalvikvm(624): GC_FOR_ALLOC freed 343K, 9% free 6309K/6919K, paused 48ms, total 48ms
11-03 13:58:28.936: I/dalvikvm-heap(624): Grow heap (frag case) to 7.085MB for 921616-byte allocation
11-03 13:58:29.006: D/dalvikvm(624): GC_CONCURRENT freed <1K, 9% free 7209K/7879K, paused 32ms+3ms, total 69ms
11-03 13:58:29.156: D/dalvikvm(624): GC_FOR_ALLOC freed 0K, 9% free 7209K/7879K, paused 28ms, total 28ms
11-03 13:58:29.166: I/dalvikvm-heap(624): Grow heap (frag case) to 7.476MB for 409936-byte allocation
11-03 13:58:29.216: D/dalvikvm(624): GC_CONCURRENT freed 0K, 9% free 7609K/8327K, paused 25ms+4ms, total 50ms
11-03 13:58:29.216: D/dalvikvm(624): WAIT_FOR_CONCURRENT_GC blocked 25ms
11-03 13:58:29.416: D/gralloc_goldfish(624): Emulator without GPU emulation detected.
11-03 14:00:42.286: I/Choreographer(624): Skipped 162 frames!  The application may be doing too much work on its main thread.
11-03 14:00:42.656: I/Choreographer(624): Skipped 44 frames!  The application may be doing too much work on its main thread.
11-03 14:03:55.266: E/Trace(672): error opening trace file: No such file or directory (2)
11-03 14:03:56.456: D/dalvikvm(672): GC_FOR_ALLOC freed 128K, 3% free 6156K/6343K, paused 35ms, total 36ms
11-03 14:03:56.546: D/dalvikvm(672): GC_FOR_ALLOC freed 1K, 4% free 6498K/6727K, paused 24ms, total 24ms
11-03 14:03:56.576: D/dalvikvm(672): GC_FOR_ALLOC freed 343K, 9% free 6309K/6919K, paused 24ms, total 24ms
11-03 14:03:56.586: I/dalvikvm-heap(672): Grow heap (frag case) to 7.085MB for 921616-byte allocation
11-03 14:03:56.656: D/dalvikvm(672): GC_CONCURRENT freed <1K, 9% free 7209K/7879K, paused 22ms+14ms, total 65ms
11-03 14:03:56.776: D/dalvikvm(672): GC_FOR_ALLOC freed 0K, 9% free 7209K/7879K, paused 22ms, total 22ms
11-03 14:03:56.776: I/dalvikvm-heap(672): Grow heap (frag case) to 7.476MB for 409936-byte allocation
11-03 14:03:56.826: D/dalvikvm(672): GC_CONCURRENT freed 0K, 9% free 7609K/8327K, paused 15ms+4ms, total 47ms
11-03 14:03:56.826: D/dalvikvm(672): WAIT_FOR_CONCURRENT_GC blocked 15ms
11-03 14:03:57.046: D/gralloc_goldfish(672): Emulator without GPU emulation detected.
11-03 14:03:57.516: I/Choreographer(672): Skipped 42 frames!  The application may be doing too much work on its main thread.
11-03 14:52:41.686: E/Trace(720): error opening trace file: No such file or directory (2)
11-03 14:52:42.576: D/dalvikvm(720): GC_FOR_ALLOC freed 75K, 3% free 6147K/6275K, paused 41ms, total 42ms
11-03 14:52:42.666: D/dalvikvm(720): GC_FOR_ALLOC freed 1K, 3% free 6490K/6663K, paused 28ms, total 28ms
11-03 14:52:42.716: D/dalvikvm(720): GC_FOR_ALLOC freed 343K, 9% free 6300K/6855K, paused 24ms, total 24ms
11-03 14:52:42.726: I/dalvikvm-heap(720): Grow heap (frag case) to 7.078MB for 921616-byte allocation
11-03 14:52:42.806: D/dalvikvm(720): GC_CONCURRENT freed <1K, 8% free 7200K/7815K, paused 23ms+24ms, total 78ms
11-03 14:52:42.926: D/dalvikvm(720): GC_FOR_ALLOC freed 0K, 8% free 7200K/7815K, paused 22ms, total 22ms
11-03 14:52:42.926: I/dalvikvm-heap(720): Grow heap (frag case) to 7.468MB for 409936-byte allocation
11-03 14:52:42.976: D/dalvikvm(720): GC_CONCURRENT freed 0K, 9% free 7601K/8263K, paused 14ms+4ms, total 48ms
11-03 14:52:42.976: D/dalvikvm(720): WAIT_FOR_CONCURRENT_GC blocked 14ms
11-03 14:52:43.017: D/AndroidRuntime(720): Shutting down VM
11-03 14:52:43.017: W/dalvikvm(720): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
11-03 14:52:43.036: E/AndroidRuntime(720): FATAL EXCEPTION: main
11-03 14:52:43.036: E/AndroidRuntime(720): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.devoir3/com.example.devoir3.MainActivity}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
11-03 14:52:43.036: E/AndroidRuntime(720):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
11-03 14:52:43.036: E/AndroidRuntime(720):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
11-03 14:52:43.036: E/AndroidRuntime(720):  at android.app.ActivityThread.access$600(ActivityThread.java:130)
11-03 14:52:43.036: E/AndroidRuntime(720):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
11-03 14:52:43.036: E/AndroidRuntime(720):  at android.os.Handler.dispatchMessage(Handler.java:99)
11-03 14:52:43.036: E/AndroidRuntime(720):  at android.os.Looper.loop(Looper.java:137)
11-03 14:52:43.036: E/AndroidRuntime(720):  at android.app.ActivityThread.main(ActivityThread.java:4745)
11-03 14:52:43.036: E/AndroidRuntime(720):  at java.lang.reflect.Method.invokeNative(Native Method)
11-03 14:52:43.036: E/AndroidRuntime(720):  at java.lang.reflect.Method.invoke(Method.java:511)
11-03 14:52:43.036: E/AndroidRuntime(720):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
11-03 14:52:43.036: E/AndroidRuntime(720):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-03 14:52:43.036: E/AndroidRuntime(720):  at dalvik.system.NativeStart.main(Native Method)
11-03 14:52:43.036: E/AndroidRuntime(720): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
11-03 14:52:43.036: E/AndroidRuntime(720):  at android.app.ListActivity.onContentChanged(ListActivity.java:243)
11-03 14:52:43.036: E/AndroidRuntime(720):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:259)
11-03 14:52:43.036: E/AndroidRuntime(720):  at android.app.Activity.setContentView(Activity.java:1867)
11-03 14:52:43.036: E/AndroidRuntime(720):  at com.example.devoir3.MainActivity.onCreate(MainActivity.java:38)
11-03 14:52:43.036: E/AndroidRuntime(720):  at android.app.Activity.performCreate(Activity.java:5008)
11-03 14:52:43.036: E/AndroidRuntime(720):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
11-03 14:52:43.036: E/AndroidRuntime(720):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
11-03 14:52:43.036: E/AndroidRuntime(720):  ... 11 more

11-03 13:58:28.496:E/Trace（624）：打开跟踪文件时出错：没有这样的文件或目录（2）
11-03 13:58:28.776:D/dalvikvm（624）：释放125K的所有物质的GC_，3%的自由6156K/6343K，暂停41ms，总计43ms
11-03 13:58:28.866:D/dalvikvm（624）：释放1K的所有数据的GC_，4%的空闲6498K/6727K，暂停23ms，总计23ms
11-03 13:58:28.926:D/dalvikvm（624）：释放343K的所有物质的GC_，9%释放6309K/6919K，暂停48毫秒，总计48毫秒
11-03 13:58:28.936:I/dalvikvm堆（624）：为921616字节分配将堆（frag大小写）增长到7.085MB
11-03 13:58:29.006:D/dalvikvm（624）：GC_并发释放您的活动扩展
列表活动
，如果您从
活动扩展
，您应该没有问题
“但是我的应用程序在启动时崩溃：”-出现了什么错误？请发布日志。问题使用日志编辑。您可能需要发布活动代码的其余部分。您的列表声明或您如何将其设置为适配器似乎存在问题。当您按下“button3”按钮或启动时，您的应用程序是否会崩溃？您的应用程序正在崩溃，因为您正在扩展ListActivity，这要求您的布局中有一个id为android.R.id.list的listview。按照我提供给您的链接查看如何修复它。我这样做了，然后我得到一个错误：对于类型new View.OnClickListener（）{}方法getListView（）未定义，这是正确的，但是您在哪里使用此方法？我将尝试更好地解释：ListActivity是一个默认的android活动，它只包含一个ListView，并且它具有此方法“getListView（）”如果您想获得对它的引用。在活动中，您有按钮和其他东西，因此您必须创建自己的活动。将“getListView（）”替换为“listView1”或“listView2”（我不知道您需要什么）。谢谢，这就是问题所在。不过，当我启动应用程序并单击某个项目上的“删除”按钮时，它只是取消了该项目的标记，并没有将其从列表中删除