android如何退出多个Activity

  1. 说明
    在项目开发过程中，我们一定会遇到这样的需求，就是——一次性退出多个Activity。网上最常见的解决方案就是定义list集合，然后在onCreate()方法中将每个Activity添加到list集合中，在onDestroy()中去移除list集合中的Activity；或者就是广播或者其他的方案等等，今天我们就把这个问题的常用解决方案总结下，这个是我参照网上的解决方案自己汇总在一起，可能总结的不是很全，敬请谅解。

  2. 解决方案
    常见的解决方案有5种：堆栈管理器、list集合、广播、startActivityForResult()方法跳转然后用请求码和结果码判断、使用FLAG_ACTIVITY_CLEAR_TOP退出整个程序，就是这5种，其中常用的有堆栈管理器、list集合、广播，其余两种不太常用，那么下边我们就对这5种方法进行具体分析下：

  3. 5种方法具体分析
    3.1>：通过堆栈管理器去管理
    定义一个堆栈管理器，写成单例模式，在里边new Stack()栈，在每个Activity的onCreate()中将对应Activity添加到栈，在最后一个Activity的点击去移除栈中activity，然后 将activity置为null即可，具体代码如下：

/**
 * Email 2185134304@qq.com
 * Created by JackChen on 2018/1/31.
 * Version 1.0
 * Description:
 */
public class StackManager {
    /**
     * Stack �ж�Ӧ��Activity�б�  ��Ҳ����д�� Stack<Activity>��
     */
    private static Stack mActivityStack;
    private static StackManager mInstance;

    /**
     * @���� ��ȡջ������
     * @return ActivityManager
     */
    public static StackManager getStackManager() {
        if (mInstance == null) {
            mInstance = new StackManager();
        }
        return mInstance;
    }

    /**
     * �Ƴ�ջ��Activity
     */
    public void popActivity(Activity activity) {
        if (activity != null) {
            activity.finish();
            mActivityStack.remove(activity);
            activity = null;
        }
    }

    /**
     * ��õ�ǰջ��Activity
     */
    public Activity currentActivity() {
        //lastElement()��ȡ������Ԫ�أ�������ջ����Activity
        if(mActivityStack == null || mActivityStack.size() ==0){
            return null;
        }
        Activity activity = (Activity) mActivityStack.lastElement();
        return activity;
    }

    /**
     * ����ǰActivity����ջ��
     */
    public void pushActivity(Activity activity) {
        if (mActivityStack == null) {
            mActivityStack = new Stack();
        }
        mActivityStack.add(activity);
    }

    /**
     * ����ָ����clsss����ջ������������Activity
     * @clsss : ָ������ 
     */
    public void popTopActivitys(Class clsss) {
        while (true) {
            Activity activity = currentActivity();
            if (activity == null) {
                break;
            }
            if (activity.getClass().equals(clsss)) {
                break;
            }
            popActivity(activity);
        }
    }
    
    /**
     * ����ջ������Activity
     */
    public void popAllActivitys() {
        while (true) {
            Activity activity = currentActivity();
            if (activity == null) {
                break;
            }
            popActivity(activity);
        }
    }
}

FirstStep.this代码如下：

public class FirstStep extends BaseActivity {

    private Button btn_next_step;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.first_step);

        initView() ;
        mStackManager.getStackManager().pushActivity(this); //把Activity添加到栈中
    }

    private void initView() {
        btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(FirstStep.this , SecondStep.class));
            }
        });

    }
}

SecondStep.this代码如下：

public class SecondStep extends BaseActivity {

    private Button btn_next_step;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second_step);

        initView() ;
        mStackManager.getStackManager().pushActivity(this); //把Activity添加到栈中
    }

    private void initView() {
        btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(SecondStep.this , ThirdStep.class));
            }
        });
        
    }
}

ThirdStep.this代码如下：

public class ThirdStep extends BaseActivity {

    private Button btn_next_step;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.third_step);

        initView() ;
        mStackManager.getStackManager().pushActivity(this); //把Activity添加到栈中
    }

    private void initView() {
        btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(ThirdStep.this , FourthStep.class));
            }
        });
        
    }
}

FourthStep.this代码如下：

public class FourthStep extends BaseActivity {

    private Button btn_finish;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fourth_step);
        initView() ;
        mStackManager.getStackManager().pushActivity(this); //把Activity添加到栈中
    }

    private void initView() {
        btn_finish = (Button) findViewById(R.id.btn_finish);
        btn_finish.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mStackManager.getStackManager().popAllActivitys();
            }
        });
        
    }
}

3.2>：使用list集合：
在BaseApplication中定义list集合，然后定义addActivity()<用于在每个Activity初始化时将该Activity添加到集合中>、clearActivity()<用于清空list集合>、exit()方法<用于遍历集合退出所有Activity>，然后在每个Activity的onCreate()方法中调用addActivity()，在onDestroy()中调用clearActivity()，然后在最后一个Activity调用exit()即可，具体代码如下：

/**
 * Email 2185134304@qq.com
 * Created by JackChen on 2018/1/31.
 * Version 1.0
 * Description:
 */
public class AppApplication extends Application {
    private static AppApplication mAppApplication;
    /** ��ǰ�򿪵�activity�б� */
    public ArrayList<Activity> activityList;

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
        mAppApplication = this;
    }

    /** ��ȡApplication */
    public static AppApplication getApp() {
        if (mAppApplication == null) {
            mAppApplication = new AppApplication();
        }
        return mAppApplication;
    }

    /** 给集合添加activity */
    public void addActivity(Activity acitivity) {
        if(activityList == null){
            activityList = new ArrayList<Activity>();
        }
        activityList.add(acitivity);
    }
    
    /** 从集合移除activity */
    public void clearActivity(){
        activityList.clear();
    }

    /** 遍历集合，清除集合所有的activity */
    public void exit() {
        for (Activity activity : activityList) {
            activity.finish();
        }
        clearActivity();//ǧ��ǵ����ȡ�����á�
        System.exit(0);
    }
}

FirstStep.this代码如下：

public class FirstStep extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.first_step);

        initView() ;

        AppApplication.getApp().addActivity(this);   //把Activity添加到集合中
    }

    private void initView() {
        Button btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(FirstStep.this , SecondStep.class));
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        AppApplication.getApp().clearActivity();  //清除list集合
    }
}

SecondStep.this代码如下：

public class SecondStep extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second_step);


        initView() ;

        AppApplication.getApp().addActivity(this);   //把Activity添加到集合中
    }

    private void initView() {
        Button btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(SecondStep.this , ThirdStep.class));
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        AppApplication.getApp().clearActivity();  //清除list集合
    }
}

ThirdStep.this代码如下：

public class ThirdStep extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.third_step);
        initView() ;

        AppApplication.getApp().addActivity(this);   //把Activity添加到集合中
    }

    private void initView() {
        Button btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(ThirdStep.this , FourthStep.class));
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        AppApplication.getApp().clearActivity();  //清除list集合
    }
}

FourthStep.this代码如下：

public class FourthStep extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fourth_step);

        initView() ;

        AppApplication.getApp().addActivity(this);   //把Activity添加到集合中
    }

    private void initView() {
        Button btn_finish = (Button) findViewById(R.id.btn_finish);
        btn_finish.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AppApplication.getApp().exit();
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        AppApplication.getApp().clearActivity();  //清除list集合
    }
}

3.3>：使用广播
在BaseActivity中，注册、接收广播，然后让每个Activity继承BaseActivity，并且在每个Activity的onDestroy()中注销广播，在最后一个Activity发送广播，然后在BaseActivity中接收广播的onReceive()方法中finish()即可，具体代码如下：

/**
 * Email 2185134304@qq.com
 * Created by JackChen on 2018/1/31.
 * Version 1.0
 * Description:
 */
public class BaseActivity extends Activity {

    //用于广播的标志
    public final static String INIENT_FINISH = "com.allfinish.method.finish";

    //用于startActivityForResult()的标志
    public final static int FINISH_REQUESTCODE = 1;
    public final static int FINISH_RESULTCODE = 1;



    public StackManager mStackManager ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }


    /**
     * 注册广播
     */
    public void initReceiver(){
        IntentFilter filter = new IntentFilter() ;
        filter.addAction(INIENT_FINISH);
        registerReceiver(mRceiver , filter) ;
    }


    /**
     * 初始化广播接收者
     */
    public BroadcastReceiver mRceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (INIENT_FINISH.equals(intent.getAction())){
                finish();
            }
        }
    } ;


    /**
     * 用于startActivityForResult()
     * @param requestCode
     * @param resultCode
     * @param data
     */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == FINISH_REQUESTCODE){
            if (resultCode == FINISH_RESULTCODE){
                setResult(FINISH_REQUESTCODE);
                finish();
            }
        }
    }
}

FirstStep.this代码如下：

public class FirstStep extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.first_step);

        initView();
        initReceiver();
    }

    private void initView() {
        Button btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(FirstStep.this , SecondStep.class));
            }
        });
    }


    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(mRceiver);
    }
}

SecondStep.this代码如下：

public class SecondStep extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second_step);

        initView();
        initReceiver();
    }

    private void initView() {
        Button btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(SecondStep.this , ThirdStep.class));
            }
        });
    }


    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(mRceiver);
    }
}

ThirdStep.this代码如下：

public class ThirdStep extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.third_step);

        initView();
        initReceiver();
    }

    private void initView() {
        Button btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(ThirdStep.this , FourthStep.class));
            }
        });
    }


    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(mRceiver);
    }
}

FourthStep.this代码如下：

public class FourthStep extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fourth_step);

        initView();
        initReceiver();
    }

    private void initView() {
        Button btn_finish = (Button) findViewById(R.id.btn_finish);
        btn_finish.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sendFinish();
            }
        });
    }

    private void sendFinish() {
        getApplicationContext().sendBroadcast(new Intent(INIENT_FINISH));
    }


    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(mRceiver);
    }
}

3.4>：使用startActivityForResult()方法跳转，然后用请求吗和结果码判断：
在第一、第二、第三个Activity中使用startActivityForResult(new Intent(FirstStep.this , SecondStep.class) , FINISH_REQUESTCODE)携带请求码跳转Activity，然后在最后一个Activity使用setResult(FINISH_RESULTCODE);用结果码，然后finish()最后一个Activity，然后在BaseActivity中写onActivityResult()方法，使用返回码和结果码，如果自己定义的请求码和返回码与返回的相等，就执行setResult(FINISH_RESULTCODE);并且finish()即可，具体代码如下：

FirstStep.this代码如下：

public class FirstStep extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.first_step);

        initView() ;
    }

    private void initView() {
        Button btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivityForResult(new Intent(FirstStep.this , SecondStep.class) , FINISH_REQUESTCODE);
            }
        });
    }
}

SecondStep.this代码如下：

public class SecondStep extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.second_step);

        initView() ;
    }

    private void initView() {
        Button btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivityForResult(new Intent(SecondStep.this , ThirdStep.class) , FINISH_REQUESTCODE);
            }
        });
    }
}

ThirdStep.this代码如下：

public class ThirdStep extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.third_step);

        initView() ;
    }

    private void initView() {
        Button btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivityForResult(new Intent(ThirdStep.this , FourthStep.class) , FINISH_REQUESTCODE);
            }
        });
    }
}

FourthStep.this代码如下：

public class FourthStep extends BaseActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fourth_step);

        initView() ;
    }

    private void initView() {
        Button btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                setResult(FINISH_RESULTCODE);  //结果码
                finish();
            }
        });
    }
}

3.5>：使用 FLAG_ACTIVITY_CLEAR_TOP 退出整个程序，不过不常用：
从第一个Activity跳转到第二个Activity，第二个Activity跳转到第三个Activity，第三个Activity跳转到第四个Activity，然后从第四个跳转到第一个Activity需要使用 intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP) ;
代码如下：

FirstStep.this代码如下：

public class FirstStep extends BaseActivity {

    private Button btn_next_step;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.first_step);

        initView() ;
    }

    private void initView() {
        btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(FirstStep.this , SecondStep.class));
            }
        });
    }
}

SecondStep.this代码如下：

public class SecondStep extends BaseActivity {

    private Button btn_next_step;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.first_step);

        initView() ;
    }

    private void initView() {
        btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(SecondStep.this , ThirdStep.class));
            }
        });
    }
}

ThirdStep.this代码如下：

public class ThirdStep extends BaseActivity {

    private Button btn_next_step;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.first_step);

        initView() ;
    }

    private void initView() {
        btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(ThirdStep.this , FourthStep.class));
            }
        });
    }
}

FourthStep.this代码如下：

public class FourthStep extends BaseActivity {

    private Button btn_next_step;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fourth_step);

        initView() ;
    }

    private void initView() {
        btn_next_step = (Button) findViewById(R.id.btn_next_step);
        btn_next_step.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(FourthStep.this , MainActivity.class) ;
                intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP) ;
                startActivity(intent);

            }
        });
    }
}

ok，到这里，我们就全部讲完了退出多个Activity的5种方法，大家有什么不懂的，不太明白的可以直接看注释，代码中注释很详细，如果还是不太懂的可以加我QQ：2185134304.
具体代码已上传至github：
https://github.com/shuai999/FinishMoreActivity.git

最后编辑于 ：
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