学习笔记：两个开发过程的小技巧

1.在实际开发中，咱们常常会遇到查看当前Activity叫什么名字，是哪一个类，当咱们去翻阅别的的代码时，真是头疼，因此可已在项目的BaseActivity中写一个获得Activity名称的方法，继承这个Base的Activity的名字都会被打印出来，以下

public class BaseActivity extends AppCompatActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.e("className:", getActivityName());
    }

    private String getActivityName() {
        return getClass().getSimpleName();
    }

} 

运行结果：

2.在开发中可能会遇到随时随地退出程序的时候，这时候该怎么处理呢，能够写一个Activity的管理类，想退出时，依次finish掉Activity

public class ActivityControler {
    private static List<Activity> activityList = new ArrayList<>();

    //添加Actiivty
    public static void addActiivty(Activity activity) {
        activityList.add(activity);
    }

    //删除Activity
    public static void removeActivity(Activity activity) {
        activityList.remove(activity);
    }

    //退出程序时逐个关闭
    public static void removeAllActivity() {
        if (!activityList.isEmpty()) {
            for (Activity activity : activityList) {
                if (!activity.isFinishing())
                    activity.finish();
            }
        }
    }
}

而后在BaseActivity生命周期中作添加和删除操做

public class BaseActivity extends AppCompatActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.e("className:", getActivityName());
    }

    private String getActivityName() {
        return getClass().getSimpleName();
    }
    @Override
    protected void onResume() {
        super.onResume();
        ActivityControler.addActiivty(this);
    }

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

若是想在某一个Actiivty中退出程序

public class SecondActivity extends BaseActivity {
    private Button mButton;
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        mButton = (Button) findViewById(R.id.button);
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ActivityControler.removeAllActivity();
                //android.os.Process.killProcess(android.os.Process.myPid());
            }
        });
    }
}

若是想保证程序彻底退出，能够在finish掉全部Actiivty以后加上结束进程代码android.os.Process.killProcess(android.os.Process.myPid())