如何在一个app中随时退出所有活动，不用一直按back

新建一个BaseActivity类

1. 新建一个BaseActivity类, 继承自AppCompatActivity
2. 重写onCreat()
3. 所有的activity继承自自BaseActivity

   public class BaseActivity extends AppCompatActivity{
   @Override
   protected void onCreate(@Nullable Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       Log.d("BaseActivity", getClass().getSimpleName());  // 获取活动名称
   }
   

新建ActivityCollector 类作为活动管理器

1. 通过一个List来暂存活动
2. 提供一个addActivity()方法向List添加一个活动
3. 提供一个removeActivity()方法来移除List中活动
4. 提供finishAll()方法来销毁所有List中活动

public class ActivityCollector {
    public static List<Activity> activities = new ArrayList<>();

    public static void addActivity(Activity activity){
        activities.add(activity);
    }

    public static void removeActivity(Activity activity) {
        activities.remove(activity);
    }

    public static void finishyAll(){
        for(Activity activity:activities){  // 遍历
            if(!activity.isFinishing()){
                activity.finish();
            }
        }
        activities.clear();
    }
}

修改BaseActivity

public class BaseActivity extends AppCompatActivity{
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d("BaseActivity", getClass().getSimpleName());
        ActivityCollector.addActivity(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        ActivityCollector.removeActivity(this);
    }
}

活动中添加鼠标监听

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d("ThirdAcitivity", "Task id is "+getTaskId());
        setContentView(R.layout.thrid_activity);
        Button button3 = (Button) findViewById(R.id.button_3);
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ActivityCollector.finishyAll();
            }
        });

    }

这是我学习Android的笔记,参考书<<第一行代码-第二版>>,感谢郭霖大神
如有不足之处,可以一起讨论
附上郭霖的blog http://blog.csdn.net/guolin_blog