Android App ForceCloses on Starting of a new activity

问题

I am new to android development and I have been having issues with Force Close on new Android Activity Pages.

My Structure is like this:

Main Page -> Menu Page (Works Fine) -> New Game Screen(force closes)

Call to the Activity:

    public void btnNewGame_Click(View view)
{
    Intent i = new Intent(this, NewGameScreen.class);
    startActivityForResult(i, ACTIVITY_CREATE);
}

Manifest

        <activity  android:name=".NewGameScreen"
                android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

XML

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



    <ExpandableListView
        android:id="@+id/eLVGameList"
        android:layout_width="match_parent"
        android:layout_gravity="center_vertical"
        android:layout_weight=".75"
        android:background="@null" android:layout_height="0dip">

    </ExpandableListView>

</LinearLayout>

NewGameScreenActivity

    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.loadgame);


   ExpandableListView epView = (ExpandableListView) findViewById(R.id.eLVGameList);
   ExpandableListAdapter mAdapter = new GameListAdapter();
   epView.setAdapter(mAdapter);

Errors:

03-05 20:16:57.375: E/AndroidRuntime(887): FATAL EXCEPTION: main
03-05 20:16:57.375: E/AndroidRuntime(887): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.helloandroid/com.example.helloandroid.NewGameScreen}: java.lang.RuntimeException: Your content must have a ExpandableListView whose id attribute is 'android.R.id.list'
03-05 20:16:57.375: E/AndroidRuntime(887):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
03-05 20:16:57.375: E/AndroidRuntime(887):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
03-05 20:16:57.375: E/AndroidRuntime(887):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
03-05 20:16:57.375: E/AndroidRuntime(887):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
03-05 20:16:57.375: E/AndroidRuntime(887):  at android.os.Handler.dispatchMessage(Handler.java:99)
03-05 20:16:57.375: E/AndroidRuntime(887):  at android.os.Looper.loop(Looper.java:137)
03-05 20:16:57.375: E/AndroidRuntime(887):  at android.app.ActivityThread.main(ActivityThread.java:4424)
03-05 20:16:57.375: E/AndroidRuntime(887):  at java.lang.reflect.Method.invokeNative(Native Method)
03-05 20:16:57.375: E/AndroidRuntime(887):  at java.lang.reflect.Method.invoke(Method.java:511)
03-05 20:16:57.375: E/AndroidRuntime(887):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
03-05 20:16:57.375: E/AndroidRuntime(887):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
03-05 20:16:57.375: E/AndroidRuntime(887):  at dalvik.system.NativeStart.main(Native Method)
03-05 20:16:57.375: E/AndroidRuntime(887): Caused by: java.lang.RuntimeException: Your content must have a ExpandableListView whose id attribute is 'android.R.id.list'
03-05 20:16:57.375: E/AndroidRuntime(887):  at android.app.ExpandableListActivity.onContentChanged(ExpandableListActivity.java:222)
03-05 20:16:57.375: E/AndroidRuntime(887):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:254)
03-05 20:16:57.375: E/AndroidRuntime(887):  at android.app.Activity.setContentView(Activity.java:1835)
03-05 20:16:57.375: E/AndroidRuntime(887):  at com.example.helloandroid.NewGameScreen.onCreate(NewGameScreen.java:22)
03-05 20:16:57.375: E/AndroidRuntime(887):  at android.app.Activity.performCreate(Activity.java:4465)
03-05 20:16:57.375: E/AndroidRuntime(887):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
03-05 20:16:57.375: E/AndroidRuntime(887):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
03-05 20:16:57.375: E/AndroidRuntime(887):  ... 11 more

回答1:

Change your ExpandableListView id with this

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

and if your class extends Activity then change it to

public class className extends ListActivity

and you can get your ExpandableListView by calling the method

ExpandableListView listView = getListView();

回答2:

The answer is very simple, you just forgot to insert the NewGameScreen Activity's Entry in the AndroidManiFest.xml Write down following line in your AndroidManifest.xml file before the tag.

<activity android:name=".NewGameScreen"></activity>

And also important thing that your NewGameScreen class must extends Activity

回答3:

You need to give the id of your ListView as android:id="@android:id/list" , if you are extending LIstActivity. Then you can get your ListView handler from getLIstView(); If you are extending Activity, then you can give any other id to your ListView and get it using findViewbyId() From the LOgCat trace, it looks like you are using ListActivity.

来源：https://stackoverflow.com/questions/9577927/android-app-forcecloses-on-starting-of-a-new-activity

标签

android

manifest

forceclose