Question

编辑：更改了代码以反映建议的答案...仍然认为我遗漏了某些内容

我在扩展Thread的类中运行游戏，并希望能够在特定时间调用执行图形的类。要做到这一点，我试图使用意图打开类，但无法让它工作。这是代码：

NewGameThread.java：

import android.content.Context;

public class NewGameThread extends Thread {

private Context context;

public GameView mGameView;

public NewGameThread(GameView gameView, Context context) {      
    mGameView = gameView;
    this.context = context;
}   
}

NewTheGame.java：

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class NewTheGame extends NewGameThread {


private Bitmap mBall;
private float mSmileyBallX = -100;
private float mSmileyBallY = -100;

public NewTheGame(GameView gameView) {

    super(gameView);
    //Set up my bitmaps
    mBall = BitmapFactory.decodeResource
            (gameView.getContext().getResources(), 
                    R.drawable.small_red_ball);

}
protected void updateGame(float secondsElapsed) {
    if(mSmileyBallX == mSmileyBallY) { //it actually calls another function that I removed for simplicity
        Intent intent = new Intent(context,Launcher.class);
        context.startActivity(intent);
    }
}

Answer 1

您需要活动类的上下文，因此在NewGameThread

中需要一个构造函数

Context context;

public NewGameThread(Context context)
{
   this.context = context;
}

然后在你的代码中你必须使用这样的上下文：

Intent intent = new Intent (context, Launcher.class);
context.startActivity(intent);

Answer 2

应该从活动传递上下文。从Activity创建类NewGameThread的对象时，在构造函数中传递活动的上下文。在意图调用中使用该上下文。

public class NewGameThread extends Thread {

    public NewGameThread(Context c){
        this.context = c;
    }  

    protected void getActTwo() {        
        Intent intent = new Intent(this.context,ActivityTwo.class);
        context.startActivity(intent);
    }
}

Android：无法从扩展Thread的类调用新活动

2 个答案: