Question

我想创建非常简单的ListView，但不幸的是每次应用程序都会崩溃。这是我的代码：

import android.app.ListActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends ListActivity implements OnItemClickListener {

    public static String[] daysArray = {"Ponedeljek", "Torek", "Sreda", "Četrtek", "Petek", "Sobota", "Nedelja"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, daysArray);

        setListAdapter(adapter);

        ListView lv = getListView();
        lv.setOnItemClickListener(this);

    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        // TODO Auto-generated method stub
        Log.i("Info", "CLICKED");
    }

}

布局main.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <ListView android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

修改

02-18 14:56:51.549: D/dalvikvm(2618): GC_FOR_ALLOC freed 68K, 6% free 3096K/3280K, paused 17ms, total 17ms
02-18 14:56:51.561: I/dalvikvm-heap(2618): Grow heap (frag case) to 4.202MB for 1127532-byte allocation
02-18 14:56:51.565: D/dalvikvm(2618): GC_FOR_ALLOC freed 2K, 5% free 4195K/4384K, paused 4ms, total 4ms
02-18 14:56:51.581: D/AndroidRuntime(2618): Shutting down VM
02-18 14:56:51.585: W/dalvikvm(2618): threadid=1: thread exiting with uncaught exception (group=0xa4d89b20)
02-18 14:56:51.585: E/AndroidRuntime(2618): FATAL EXCEPTION: main
02-18 14:56:51.585: E/AndroidRuntime(2618): Process: com.example.listsstudy, PID: 2618
02-18 14:56:51.585: E/AndroidRuntime(2618): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.listsstudy/com.example.listsstudy.MainActivity}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
02-18 14:56:51.585: E/AndroidRuntime(2618):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at android.os.Handler.dispatchMessage(Handler.java:102)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at android.os.Looper.loop(Looper.java:136)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at android.app.ActivityThread.main(ActivityThread.java:5017)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at java.lang.reflect.Method.invokeNative(Native Method)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at java.lang.reflect.Method.invoke(Method.java:515)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at dalvik.system.NativeStart.main(Native Method)
02-18 14:56:51.585: E/AndroidRuntime(2618): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
02-18 14:56:51.585: E/AndroidRuntime(2618):     at android.app.ListActivity.onContentChanged(ListActivity.java:243)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:293)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at android.app.Activity.setContentView(Activity.java:1929)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at com.example.listsstudy.MainActivity.onCreate(MainActivity.java:19)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at android.app.Activity.performCreate(Activity.java:5231)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
02-18 14:56:51.585: E/AndroidRuntime(2618):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
02-18 14:56:51.585: E/AndroidRuntime(2618):     ... 11 more

Answer 1

您正在延长ListActivity。您的ListView必须

android:id="@android:id/list"

作为id。

Answer 2

需要使用

android:id="@android:id/list"

而不是：

android:id="@+id/listView"

如果您使用ListActivity。或者只是尝试使用Activity，而不是ListActivity

编辑：我的代码; 布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="match_parent"
              android:layout_height="match_parent">
    <ListView android:id="@android:id/list"
              android:layout_width="match_parent"
              android:layout_height="match_parent"/>
...

在我班上：

public class AnyNameHere extends ListActivity  {
    @Override
    protected void onCreate ( Bundle savedInstanceState ) {
        super.onCreate ( savedInstanceState );
        setContentView ( R.layout.listview );
            // do what you want here;
}

它的工作：）

Answer 3

你的ListView有错误的ID。来自documentation：

为此，您自己的视图必须包含带有id的ListView对象 “@android：id / list”（或列表，如果它在代码中）

Answer 4

因为你的setContentView方法调用。

Answer 5

当您希望entend ListActivity创建活动时，MainActivity，ListView xml必须标识为android:id list，如下所示。 ..

<ListView 
    android:id="@+id/list"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

ListView崩溃应用程序

5 个答案: