我试图从另一个活动中调用静态方法来找到分数的整数:
public class HighscoreActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.highscore);
TextView txtGuess = (TextView) findViewById(R.id.txtScore);
int temp = MastermindGameActivity.getScore();
String score = Integer.toString(temp);
txtGuess.setText(score);
}
}
通过调用此方法:
public static int getScore()
{
return score;
}
为什么这不起作用?我一直在
01-14 21:28:54.347:ERROR / AndroidRuntime(1485):致命异常:主要 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):java.lang.RuntimeException:无法启动活动ComponentInfo {sam.android.mastermind / sam.android.mastermind.HighscoreActivity}:java.lang.NullPointerException 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):在android.app.ActivityThread.access $ 1500(ActivityThread.java:117) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:931) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):在android.os.Handler.dispatchMessage(Handler.java:99) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):在android.os.Looper.loop(Looper.java:123) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):在android.app.ActivityThread.main(ActivityThread.java:3683) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):at java.lang.reflect.Method.invokeNative(Native Method) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):at java.lang.reflect.Method.invoke(Method.java:507) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:839) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):at dalvik.system.NativeStart.main(Native Method) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):引起:java.lang.NullPointerException 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):at sam.android.mastermind.HighscoreActivity.blah(HighscoreActivity.java:27) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):at sam.android.mastermind.HighscoreActivity.onCreate(HighscoreActivity.java:13) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 01-14 21:28:54.347:ERROR / AndroidRuntime(1485):
......还有11个
活动在清单中定义。
答案 0 :(得分:5)
试试这个..
MastermindGameActivity masterActivity = new MastermindGameActivity();
masterActivity.getScore();
您也可以尝试将其作为我推荐的意图传递。
Intent intent=new Intent(this,Activity2.class);
intent.putIntExtra("Score" score);
并在接收活动中将其拉出来
Intent sender=getIntent();
int score = sender.getExtras().getInt("Score");