android中获取当前Activity的实例和名字
16lz
2021-01-25
很多时候需要得到当前Activity的实例和Activity的名称，下面给出实现下代码。
一、获取Activity的名字
1，首先需要获取权限
private static String getRunningActivityName(){ ActivityManager activityManager=(ActivityManager)getSystemService(Context.ACTIVITY_SERVICE); String runningActivity=activityManager.getRunningTasks(1).get(0).topActivity.getClassName(); return runningActivity; }1，设置一个Activity的管理类
public class TestActivityManager { private static TestActivityManager sInstance = new TestActivityManager(); private WeakReference sCurrentActivityWeakRef; private TestActivityManager() { } public static TestActivityManager getInstance() { return sInstance; } public Activity getCurrentActivity() { Activity currentActivity = null; if (sCurrentActivityWeakRef != null) { currentActivity = sCurrentActivityWeakRef.get(); } return currentActivity; } public void setCurrentActivity(Activity activity) { sCurrentActivityWeakRef = new WeakReference(activity); }}2，编写一个MyApplication类，继承Application，在MyApplication中实现registerActivityLifecycleCallbacks回调，监听onActivityResumed()方法。
public class MyApplication extends Application {private static Context context;@Overridepublic void onCreate() {context = getApplicationContext();registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {@Overridepublic void onActivityCreated(Activity activity, Bundle savedInstanceState) {}@Overridepublic void onActivityStarted(Activity activity) {}@Overridepublic void onActivityResumed(Activity activity) {TestActivityManager.getInstance().setCurrentActivity(activity);}@Overridepublic void onActivityPaused(Activity activity) {}@Overridepublic void onActivityStopped(Activity activity) {}@Overridepublic void onActivitySaveInstanceState(Activity activity, Bundle outState) {}@Overridepublic void onActivityDestroyed(Activity activity) {}});}public static Context getContext() {return context;}}3，在AndroidManifest.xml中加入你写的MyApplication
4，实例，返回按钮，结束当前Activity
BackBtn.setOnClickListener(new OnClickListener() {public void onClick(View v) {String activityName = getRunningActivityName(); Log.d(TAG, activityName + " is finish"); TestActivityManager.getInstance().getCurrentActivity().finish();}});
OK，就是这个样子的了，没什么特别的了，^_^
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