Question

这是我的活动：

package com.workspace.pockethero;

import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.KeyEvent;
import android.view.Window;
import android.view.WindowManager;

public class PocketHero extends Activity {
    /** Called when the activity is first created. */

    private static final String TAG = PocketHero.class.getSimpleName();
    static int centreX;
    static int centreY;
    static int bottomA;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        getWindow().setFlags(
        WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);//fullscreen
        setRequestedOrientation(
        ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);//landscape mode
        getWindow().setFlags(
        WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON,
        WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);//keep screen on
        requestWindowFeature(Window.FEATURE_NO_TITLE);//no title

        super.onCreate(savedInstanceState);
        Display display = getWindowManager().getDefaultDisplay(); 
        centreX = display.getWidth()/2;
        centreY = display.getHeight()/2;
        bottomA = display.getHeight();
        // requesting to turn the title OFF
        // making it full screen
        // set our MainGamePanel as the View
        setContentView(new MainGamePanel(this));
        Log.d(TAG, "View added");
    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
      super.onSaveInstanceState(savedInstanceState);
    }

    @Override
    public void onRestoreInstanceState(Bundle savedInstanceState) {
      super.onRestoreInstanceState(savedInstanceState);
    }

    @Override  
    public boolean onKeyDown(int keyCode, KeyEvent event)  
    {  
        //replaces the default 'Back' button action  
        if(keyCode==KeyEvent.KEYCODE_HOME)  
        {
        }
        return true;  
    } 

    @Override
    protected void onDestroy() {
        Log.d(TAG, "Destroying...");
        super.onDestroy();
    }

    @Override
    protected void onStop() {
        Log.d(TAG, "Stopping...");
        super.onStop();
    }

/** Called when the activity is first created. */
}

这项活动真是一团糟。我希望我的活动在最小化游戏时保存自己，并在我再次启动它时自我恢复。我应该在此活动中添加或删除什么？我是android开发的新手，所以我不知道这个活动还需要什么......

Answer 1

如果您希望在应用程序的执行之间保存游戏状态，那么您不希望看到保存实例状态。相反，您希望将数据保存在某种形式的持久存储中。在app启动时（在onCreate中），您将读取持久数据（或者如果没有找到则初始化默认数据 - 与第一次执行时一样）。指南主题Data Storage中描述了保存数据的选项。

Answer 2

您需要使用序列化。将您的数据（centreX ...）包装在Serializable类中，将其保存在onDestroy（）中并将其加载到onStart（）中。

以下是我整天使用的两种便捷方法：

public static Object load(String fname , Context cont)
{
    try
    {
        FileInputStream fis = cont.openFileInput(fname);
        ObjectInputStream ois = new ObjectInputStream(fis);
        Object loadedObject = ois.readObject();
        ois.close();
        fis.close();
        return loadedObject;
    }
    catch(Exception e)
    {
        Father.print("[IO.load]Load "+fname+" failed: "+ e.getMessage() );
        return null;
    }
}

public static boolean save(String fname , Object o , Context cont)
{
    try
    {
        if(o == null) Father.print("WARNING: saving null");
        FileOutputStream fos = cont.openFileOutput(fname , Context.MODE_PRIVATE);
        ObjectOutputStream oos = new ObjectOutputStream(fos);
        oos.writeObject(o);
        oos.close();
        fos.close(); 
        return true;
    }
    catch(Exception e)
    {
        Father.printe("[IO.save]Error saving object: ", e );
        return false;
    }
}

保存实例状态

2 个答案: