Java Android-无法将活动解析为类型

我是android新手，使用Eclipse（基本java和Netbeans背景）

我只是在看一个基本的游戏：

并有以下错误：

无法将活动解析为类型

((Activity)getContext()).finish();

上面是它出错的代码，我在谷歌上试过了，这里也没有什么真正的帮助，或者至少我理解了

下面是全班同学：

package Sketchy.Game.WarSoNawty;

import android.util.Log;
import android.content.Context;
import android.graphics.Canvas;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class MainGamePanel extends SurfaceView implements
    SurfaceHolder.Callback {

private static final String TAG = MainGamePanel.class.getSimpleName();

private MainThread thread;

public MainGamePanel(Context context) {
    super(context);
    //adding the callback (this) to the surface holder to intercept events
    getHolder().addCallback(this);

    //create game loop
    thread = new MainThread(getHolder(), this);

    //make the GamePanel focusable so it can handle events
    setFocusable(true);
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

}

@Override
public void surfaceCreated(SurfaceHolder holder) {
    thread.setRunning(true);
    thread.start();

}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
    boolean retry = true;
    while (retry) {
        try {
            thread.join();
            retry = false;
    }
    catch (InterruptedException e) {
        //try again shutting down the thread
    }
    }
}

@Override
public boolean onTouchEvent(MotionEvent event) {
    if (event.getAction() == MotionEvent.ACTION_DOWN) {
        if(event.getY() > getHeight() - 50) {
            thread.setRunning(false);
            ((Activity)getContext()).finish();
        }
        else {
            Log.d(TAG, "Coords: x=" +event.getX() + ",y=" + event.getY());
        }
    }
    return super.onTouchEvent(event);
}

@Override
protected void onDraw(Canvas canvas) {

}

}

我读过，这可能意味着我的清单不正确，下面是XML

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="Sketchy.Game.WarSoNawty"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="15"
        android:targetSdkVersion="21" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".WarSoNawty"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

---

提前感谢您的帮助

似乎您尚未导入

活动

类。将此行添加到导入语句中（就在

类

声明上方）：

---

我想你应该导入活动（

导入android.app.Activity

）没问题，很高兴我能帮上忙。：）

import android.app.Activity;