0
创建一个具有自定义列表视图的android应用程序。由于该活动具有其他UI元素，因此我无法通过扩展ListViewActivity来实现ListView。当我的活动开始时，我收到LogCat中的错误。android-由于列表视图导致应用程序崩溃
MainActivity.java
public class MainActivity extends Activity implements OnClickListener
{
private ListView remindersList;
private String[] values = {"Item1", "Item2", "Item3"};
List<Integer> allIDsFromDatabase = new ArrayList<Integer>();
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
remindersList = (ListView) findViewById(R.id.listView1);
remindersList.setAdapter(new ArrayAdapter<String>(this, R.layout.list_item, values));
remindersList.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
Log.d("click arg3", "item clicked : " + arg3);
}
});
remindersList.setOnItemLongClickListener(new OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
Log.d("long click", "long pressed : " + arg3);
return false;
}
});
}
activity_main.xml中
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView1"
android:src="@drawable/minussmall" android:contentDescription="@string/logo"/>
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/imageView1" >
</ListView>
</RelativeLayout>
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/textview"/>
logcat的细节
10-27 10:11:14.887: E/AndroidRuntime(630): FATAL EXCEPTION: main
10-27 10:11:14.887: E/AndroidRuntime(630): java.lang.NullPointerException
10-27 10:11:14.887: E/AndroidRuntime(630): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:355)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.widget.AbsListView.obtainView(AbsListView.java:1409)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.widget.ListView.measureHeightOfChildren(ListView.java:1216)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.widget.ListView.onMeasure(ListView.java:1127)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.view.View.measure(View.java:8313)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.widget.RelativeLayout.measureChild(RelativeLayout.java:566)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:381)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.view.View.measure(View.java:8313)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.view.View.measure(View.java:8313)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.widget.LinearLayout.measureVertical(LinearLayout.java:531)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.view.View.measure(View.java:8313)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.view.View.measure(View.java:8313)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.view.ViewRoot.performTraversals(ViewRoot.java:839)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.view.ViewRoot.handleMessage(ViewRoot.java:1859)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.os.Handler.dispatchMessage(Handler.java:99)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.os.Looper.loop(Looper.java:123)
10-27 10:11:14.887: E/AndroidRuntime(630): at android.app.ActivityThread.main(ActivityThread.java:3683)
10-27 10:11:14.887: E/AndroidRuntime(630): at java.lang.reflect.Method.invokeNative(Native Method)
10-27 10:11:14.887: E/AndroidRuntime(630): at java.lang.reflect.Method.invoke(Method.java:507)
10-27 10:11:14.887: E/AndroidRuntime(630): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
10-27 10:11:14.887: E/AndroidRuntime(630): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
10-27 10:11:14.887: E/AndroidRuntime(630): at dalvik.system.NativeStart.main(Native Method)
10-27 10:11:30.425: I/Process(630): Sending signal. PID: 630 SIG: 9
您是否实例化了'values'？ – Razgriz
@Razgriz是的！看到MainActivity.java –
看看http://stackoverflow.com/questions/12554842/new-arrayadapterstringthis-error-when-used-in-dialog-null-exception。它可能是你的上下文。 – Harley