安卓获取当前的Activity即CurrentActivity

灰太狼 2024-02-18 22:55 25阅读 0赞

安卓获取当前的Activity即CurrentActivity有两种方法：

在BaseActivity中 声明一个 ：private static volatile Activity mCurrentActivity;

public static Activity getCurrentActivity() {
        return mCurrentActivity;
    }
    
    private void setCurrentActivity(Activity activity) {
        mCurrentActivity = activity;
    }

在BaseActivity中的OnResume（）方法中：

setCurrentActivity(this);

这样在外围直接获取就可以：

Activity currentActivity = BaseActivity.getCurrentActivity();

如果想判断比如：MainActivity是不是CurrentActivity 使用方法：

BaseActivity.getCurrentActivity() instanceof MainActivity 使用 instanceof 进行判断

第二种方法：

在CCApplication中定义一个：

private volatile Activity mCurrentActivity;并且添加get set方法

public synchronized Activity getCurrentActivity() {
        return mCurrentActivity;
    }
    
    public synchronized void setCurrentActivity(Activity activity) {
        mCurrentActivity = activity;
    }

然后声明一个类：

private class CCActivityLifecycleCallbacks implements ActivityLifecycleCallbacks {
    
        @Override
        public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
        }
    
        @Override
        public void onActivityStarted(Activity activity) {
            MonkeyLog.d(TAG, "onActivityStarted :" + activity);
        }
    
        @Override
        public void onActivityResumed(Activity activity) {
            mIsInForeground = true;
            Adjust.onResume();
            setCurrentActivity(activity);
        }
    
        @Override
        public void onActivityPaused(Activity activity) {
            mIsInForeground = false;
            Adjust.onPause();
            setCurrentActivity(null);
        }
    
        @Override
        public void onActivityStopped(Activity activity) {
    
        }
    
        @Override
        public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
    
        }
    
        @Override
        public void onActivityDestroyed(Activity activity) {
    
        }
    }

在CCApplication的 onCreate()方法中调用：

registerActivityLifecycleCallbacks(new CCActivityLifecycleCallbacks());

在外围用的时候直接调用Get方法即可:

ActivityUtil.runOnUiThread(new Runnable() {
        @Override
        public void run() {
            Activity currentActivity = CCApplication.getInstance().getCurrentActivity();
           if (currentActivity != null) {
               // TODO: 2018/8/15  
           }
    
        }
    });

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