Android中获取当前正在显示的Activity
1.监听Activity的生命周期
在Application的onCreate方法中监听Activity的生命周期
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registerActivityLifecycleCallbacks(
new ActivityLifecycleCallbacks() {
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@Override
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public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
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}
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@Override
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public void onActivityStarted(Activity activity) {
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}
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@Override
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public void onActivityResumed(Activity activity) {
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MyActivityManager.getInstance().setCurrentActivity(activity);
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}
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@Override
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public void onActivityPaused(Activity activity) {
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}
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@Override
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public void onActivityStopped(Activity activity) {
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}
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@Override
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public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
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}
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@Override
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public void onActivityDestroyed(Activity activity) {
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}
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});
2.保存当前Activity的状态
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package cn.uniwa.uniwa.util;
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import android.app.Activity;
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import java.lang.ref.WeakReference;
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/**
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* Created by zhoujian on 2018/1/19.
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*/
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public
class MyActivityManager {
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private
static MyActivityManager sInstance =
new MyActivityManager();
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private WeakReference
sCurrentActivityWeakRef;
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private MyActivityManager() {
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}
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public static MyActivityManager getInstance() {
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return sInstance;
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}
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public Activity getCurrentActivity() {
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Activity currentActivity =
null;
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if (sCurrentActivityWeakRef !=
null) {
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currentActivity = sCurrentActivityWeakRef.get();
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}
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return currentActivity;
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}
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public void setCurrentActivity(Activity activity) {
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sCurrentActivityWeakRef =
new WeakReference
(activity);
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}
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}
3.使用场景
在服务中实时弹出被挤掉的对话框，就需要获取当前的Activity