我有名爲sample.xml中如下的自定義佈局,如何設置自定義佈局主視圖中的setContentView在android系統
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TableLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="@string/Constituency" />
<View
android:layout_width="wrap_content"
android:layout_height="2dip"
android:layout_marginLeft="20dp"
android:layout_marginRight="33dp"
android:layout_marginTop="10dp"
android:background="#000000" />
<TableRow
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="0dp"
android:layout_marginLeft="20dp"
android:layout_marginTop="0dp" >
<View
android:layout_width="3dp"
android:layout_height="40dp"
android:background="#000000" />
<TextView
android:id="@+id/TextView04"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginTop="0dp"
android:text="@string/Nampally" />
</TableRow>
</TableLayout>
</LinearLayout>
在MainActivity中,的setContentView設置爲
setContentView(R.Layout.activity_main)
這是默認的xml文件。現在我想在應用程序啓動時將內容視圖設置爲sample.xml。
我已經給出
setContentView(R.Layout.sample);
,當我跑我的應用程序,它說,遺憾的是應用程序失敗!錯誤。
當我調試,它表現出一定的空指針異常
這是我的logcat,
04-04 03:55:40.691: D/AndroidRuntime(2174): Shutting down VM
04-04 03:55:40.691: W/dalvikvm(2174): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-04 03:55:40.711: E/AndroidRuntime(2174): FATAL EXCEPTION: main
04-04 03:55:40.711: E/AndroidRuntime(2174): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.liveapp/com.example.liveapp.MainActivity}: java.lang.NullPointerException
04-04 03:55:40.711: E/AndroidRuntime(2174): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
04-04 03:55:40.711: E/AndroidRuntime(2174): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-04 03:55:40.711: E/AndroidRuntime(2174): at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-04 03:55:40.711: E/AndroidRuntime(2174): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-04 03:55:40.711: E/AndroidRuntime(2174): at android.os.Handler.dispatchMessage(Handler.java:99)
04-04 03:55:40.711: E/AndroidRuntime(2174): at android.os.Looper.loop(Looper.java:137)
04-04 03:55:40.711: E/AndroidRuntime(2174): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-04 03:55:40.711: E/AndroidRuntime(2174): at java.lang.reflect.Method.invokeNative(Native Method)
04-04 03:55:40.711: E/AndroidRuntime(2174): at java.lang.reflect.Method.invoke(Method.java:511)
04-04 03:55:40.711: E/AndroidRuntime(2174): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-04 03:55:40.711: E/AndroidRuntime(2174): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-04 03:55:40.711: E/AndroidRuntime(2174): at dalvik.system.NativeStart.main(Native Method)
04-04 03:55:40.711: E/AndroidRuntime(2174): Caused by: java.lang.NullPointerException
04-04 03:55:40.711: E/AndroidRuntime(2174): at com.example.liveapp.MainActivity.onCreate(MainActivity.java:49)
04-04 03:55:40.711: E/AndroidRuntime(2174): at android.app.Activity.performCreate(Activity.java:5104)
04-04 03:55:40.711: E/AndroidRuntime(2174): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
04-04 03:55:40.711: E/AndroidRuntime(2174): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
04-04 03:55:40.711: E/AndroidRuntime(2174): ... 11 more
,這我MainActivity.java,
public class MainActivity extends Activity {
public final android.content.Context Context = MainActivity.this;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final LinearLayout samplelayout=(LinearLayout)findViewById(R.layout.sample);
setContentView(R.layout.samplelayout);
}
}
什麼錯我的代碼?
請幫忙!!
你可以發佈代碼(java代碼)嗎?日誌? – 2013-04-04 03:53:31
Theres沒有問題,你的xml,它適用於我。發佈您的代碼 – 2013-04-04 03:57:51
發佈Logcat和我的代碼。 – Mahe 2013-04-04 04:04:31