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我有兩個主要活動，並Game_Activity 當我的應用程序啓動和我點擊一個按鈕，帶我到崩潰的Game_Activity ... 主要Android Studio中的程序崩潰
@覆蓋
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnHelp = (Button) findViewById(R.id.btnHelp);
Button btnStart = (Button) findViewById(R.id.btnStart);
Button btnSettings = (Button) findViewById(R.id.btnSettings);
btnStart.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view) {
Intent i = new Intent(MainActivity.this, GameActivity.class); //gets us to Game activity when Start Button is clicked
startActivity(i);
overridePendingTransition(R.animator.animation1, R.animator.animation2);
}
});
}
Game_Activity
ViewGroup kamilsLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
kamilsLayout = (ViewGroup) findViewById(R.id.kamilsLayout);
Button kamilsButton2 = (Button) findViewById(R.id.kamilsButton2);
kamilsButton2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
moveButton();
}
});
}
public void moveButton(){
View kamilsButton = findViewById(R.id.kamilsButton);
TransitionManager.beginDelayedTransition(kamilsLayout);
//Change size of the button
ViewGroup.LayoutParams sizeRules = kamilsButton.getLayoutParams();
sizeRules.height = 700;
kamilsButton.setLayoutParams(sizeRules);
}
這裏是最後行logcat的遺憾，但無法格式化...：/
03-02 21:32:49.073 22427-22427/com.example.kamil.mychemicalreaction E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.kamil.mychemicalreaction, PID: 22427
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.kamil.mychemicalreaction/com.example.kamil.mychemicalreaction.GameActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2305)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2363)
at android.app.ActivityThread.access$900(ActivityThread.java:161)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1265)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5356)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.example.kamil.mychemicalreaction.GameActivity.onCreate(GameActivity.java:25)
at android.app.Activity.performCreate(Activity.java:5426)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2269)at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2363)at android.app.ActivityThread.access$900(ActivityThread.java:161)at android.app.ActivityThread$H.handleMessage(ActivityThread.java:126)at android.os.Handler.dispatchMessage(Handler.java:102)at android.os.Looper.loop(Looper.java:157)at android.app.ActivityThread.main(ActivityThread.java:5356)at java.lang.reflect.Method.invokeNative(Native Method)at java.lang.reflect.Method.invoke(Method.java:515)at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)at dalvik.system.NativeStart.main(Native Method)
XML Game_Activity
<Button
android:layout_width="150dp"
android:layout_height="1dp"
android:id="@+id/kamilsButton"
android:gravity="bottom|fill_vertical"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:background="#ff6aff01" />
<Button
android:layout_width="50dp"
android:layout_height="50dp"
android:text="Click"
android:id="@+id/kamilsButton2"
android:textSize="9dp"
android:clickable="true"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="102dp" />
菜單
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="My Chemical Reaction"
android:id="@+id/txtTitle"
android:textStyle="bold"
android:textColor="#ffa946ff"
android:textSize="30dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<Button
android:id="@+id/btnStart"
android:text="Start"
android:textColor="#ffffffff"
android:textSize="30sp"
android:layout_width="200dp"
android:layout_height="50dp"
android:background="@drawable/buttonshape"
android:shadowColor="#A8A8A8"
android:shadowDx="0"
android:shadowDy="0"
android:shadowRadius="5"
android:layout_marginBottom="61dp"
android:layout_above="@+id/btnSettings"
android:layout_alignLeft="@+id/btnSettings"
android:layout_alignStart="@+id/btnSettings" />
<Button
android:id="@+id/btnSettings"
android:text="Settings"
android:textColor="#ffffffff"
android:textSize="30sp"
android:layout_width="200dp"
android:layout_height="50dp"
android:background="@drawable/buttonshape"
android:shadowColor="#A8A8A8"
android:shadowDx="0"
android:shadowDy="0"
android:shadowRadius="5"
android:layout_above="@+id/btnHelp"
android:layout_centerHorizontal="true"
android:layout_marginBottom="58dp" />
<Button
android:id="@+id/btnHelp"
android:text="Help"
android:textColor="#ffffffff"
android:textSize="30sp"
android:layout_width="200dp"
android:layout_height="50dp"
android:background="@drawable/buttonshape"
android:shadowColor="#A8A8A8"
android:shadowDx="0"
android:shadowDy="0"
android:shadowRadius="5"
android:layout_alignParentBottom="true"
android:layout_alignLeft="@+id/btnSettings"
android:layout_alignStart="@+id/btnSettings"
android:layout_marginBottom="81dp" />
郵政logcat的 – Manos 2015-03-02 21:17:16
安置自己的XML也請 – 2015-03-02 21:59:02
發佈的logcat的 – 2015-03-02 21:59:12