1
按鈕圖像變化的
Java代碼，按鈕圖像的Java代碼改變按鈕圖像更改錯誤
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
Button btn=(Button)findViewById(R.id.level1);
btn.setBackgroundColor(Color.BLUE);
// setContentView(new Gameview(this)`enter code here`);
setContentView(R.layout.levels);
addListenerOnButton();
}
佈局按鈕的存在，按鈕的佈局存在
<?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:background="@drawable/levelbackground"
android:gravity="center_vertical"
android:orientation="horizontal" >
<TableLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1.10" >
<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal" >
<Button
android:id="@+id/level1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:background="@drawable/level1"
android:height="79dp"
android:width="80dp" />
<Button
android:id="@+id/level2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:background="@drawable/levelloked"
android:height="79dp"
android:width="80dp" />
</TableRow>
<TableRow
android:id="@+id/tableRow2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal" >
<Button
android:id="@+id/level3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:background="@drawable/levelloked"
android:height="79dp"
android:width="80dp" />
<Button
android:id="@+id/level4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:background="@drawable/levelloked"
android:height="79dp"
android:width="80dp" />
</TableRow>
<TableRow
android:id="@+id/tableRow3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal" >
<Button
android:id="@+id/level5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:background="@drawable/levelloked"
android:height="79dp"
android:width="80dp" />
<Button
android:id="@+id/level6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:background="@drawable/levelloked"
android:height="79dp"
android:width="80dp" />
</TableRow>
<TableRow
android:id="@+id/tableRow4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal" >
</TableRow>
</TableLayout>F
</LinearLayout>
請幫助這不工作？我想更改代碼按鈕的背景圖片??我拿到零點例外...
錯誤的日誌，日誌中的錯誤，錯誤日誌
04-19 08:28:43.279: I/ApplicationPackageManager(3716): cscCountry is not German : XSG
04-19 08:28:43.279: D/AndroidRuntime(3716): Shutting down VM
04-19 08:28:43.279: W/dalvikvm(3716): threadid=1: thread exiting with uncaught exception (group=0x40018578)
04-19 08:28:43.289: E/AndroidRuntime(3716): FATAL EXCEPTION: main
04-19 08:28:43.289: E/AndroidRuntime(3716): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.hunter99x/com.hunter99x.LevelsScreen}: java.lang.NullPointerException
04-19 08:28:43.289: E/AndroidRuntime(3716): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
04-19 08:28:43.289: E/AndroidRuntime(3716): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
04-19 08:28:43.289: E/AndroidRuntime(3716): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
04-19 08:28:43.289: E/AndroidRuntime(3716): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
04-19 08:28:43.289: E/AndroidRuntime(3716): at android.os.Handler.dispatchMessage(Handler.java:99)
04-19 08:28:43.289: E/AndroidRuntime(3716): at android.os.Looper.loop(Looper.java:123)
04-19 08:28:43.289: E/AndroidRuntime(3716): at android.app.ActivityThread.main(ActivityThread.java:3687)
04-19 08:28:43.289: E/AndroidRuntime(3716): at java.lang.reflect.Method.invokeNative(Native Method)
04-19 08:28:43.289: E/AndroidRuntime(3716): at java.lang.reflect.Method.invoke(Method.java:507)
04-19 08:28:43.289: E/AndroidRuntime(3716): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
04-19 08:28:43.289: E/AndroidRuntime(3716): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
04-19 08:28:43.289: E/AndroidRuntime(3716): at dalvik.system.NativeStart.main(Native Method)
04-19 08:28:43.289: E/AndroidRuntime(3716): Caused by: java.lang.NullPointerException
04-19 08:28:43.289: E/AndroidRuntime(3716): at com.hunter99x.LevelsScreen.onCreate(LevelsScreen.java:21)
04-19 08:28:43.289: E/AndroidRuntime(3716): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-19 08:28:43.289: E/AndroidRuntime(3716): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
04-19 08:28:43.289: E/AndroidRuntime(3716): ... 11 more
嘿你的網上現在儀式?? – 2012-04-19 04:26:02
你的問題解決了什麼？ – 2012-04-19 06:02:37