學習筆記：兩個開發過程的小技巧

1.在實際開發中，咱們常常會遇到查看當前Activity叫什麼名字，是哪一個類，當咱們去翻閱別的的代碼時，真是頭疼，因此可已在項目的BaseActivity中寫一個獲得Activity名稱的方法，繼承這個Base的Activity的名字都會被打印出來，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();
    }

} 

運行結果：

2.在開發中可能會遇到隨時隨地退出程序的時候，這時候該怎麼處理呢，能夠寫一個Activity的管理類，想退出時，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);
    }

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

    //退出程序時逐個關閉
    public static void removeAllActivity() {
        if (!activityList.isEmpty()) {
            for (Activity activity : activityList) {
                if (!activity.isFinishing())
                    activity.finish();
            }
        }
    }
}

而後在BaseActivity生命週期中作添加和刪除操做

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);
    }
}

若是想在某一個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());
            }
        });
    }
}

若是想保證程序徹底退出，能夠在finish掉全部Actiivty以後加上結束進程代碼android.os.Process.killProcess(android.os.Process.myPid())