我在我的MainActivity中創建了一個公共的無效方法來切換到另一個佈局,但每當我調用此方法時,該應用程序崩潰。Android setContentView崩潰我的應用程序
的logcat:
07-05 16:35:22.823 14683-14712/com.example.name.mygame I/OpenGLRenderer: Initialized EGL, version 1.4
[ 07-05 16:35:24.724 14683:14754 D/]
HostConnection::get() New Host Connection established 0xae4b2240, tid 14754
07-05 16:35:28.500 14683-14754/com.example.name.mygame I/System.out: gameOverUi called!
-------- beginning of crash
07-05 16:35:28.558 14683-14754/com.example.name.mygame E/AndroidRuntime: FATAL EXCEPTION: Thread-218
Process: com.example.name.mygame, PID: 14683
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.Window.setContentView(int)' on a null object reference
at android.app.Activity.setContentView(Activity.java:2166)
at com.example.name.mygame.MainActivity.gameOverUi(MainActivity.java:15)
at com.example.name.mygame.GameView.gameOver(GameView.java:16)
at com.example.name.mygame.GameView.onDraw(GameView.java:188)
at com.example.name.mygame.GameLoopThread.run(GameLoopThread.java:37)
07-05 16:35:30.070 14683-14754/com.example.name.mygame I/Process: Sending signal. PID: 14683 SIG: 9
MainActivity:
package com.example.name.mygame;
import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new GameView(this));
}
public void gameOverUi(){
System.out.println("gameOverUi called!");
setContentView(R.layout.gameover); //Crash here
}
}
GameView類:
package com.example.name.mygame;
import android.content.Context;
import android.view.SurfaceView;
public class GameView extends SurfaceView {
MainActivity mActivity = new MainActivity();
public GameView(Context context) {
super(context);
//unimportant stuff
}
private void gameOver(){
mActivity.gameOverUi();
}
}
我怎樣才能改變,而不會導致我的應用程序崩潰的內容有何看法?任何答案將不勝感激,謝謝。
'mActivity =新MainActivity();'...決不讓一個新的活動一樣, –
大多數開發人員使用設置在創建mehod的佈局,爲什麼在一個單獨的方法? –