APP全局监听系统Home键

川长思鸟来 2022-09-23 05:56 250阅读 0赞

## APP全局监听系统Home键 ##

### 通过自定义Application，在Application中有一个registerActivityLifecycleCallbacks(ActivityLifecycleCallbacks a)方法，调用该方法需要重写ActivityLifecycleCallbacks接口的生命周期方法（该生命周期方法包含所有的Activity的生命周期），所以在OnActivityResume()和OnActivityPause()方法中监听Home键(注册和反注册系统广播)。 ###

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HomeWatch.java

#### 封装了Home的系统广播，实现了接口的回调 ####

public class HomeWatch { 
    
        private Context mContext;
        private IntentFilter mFilter;
        private OnHomePressedListener mListener;
        private HomeBroadcastReceiver mRecevier;
    
        public interface OnHomePressedListener { 
            void onHomePressed();
    
            void onHomeLongPressed();
        }
    
        public HomeWatch(Context context) {
            mContext = context;
            mRecevier = new HomeBroadcastReceiver();
            mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
        }
    
        /** * 设置监听 * * @param listener */
        public void setOnHomePressedListener(OnHomePressedListener listener) {
            mListener = listener;
        }
    
        /** * 开始监听，注册广播 */
        public void register() {
            if (mRecevier != null) {
                mContext.registerReceiver(mRecevier, mFilter);
            }
        }
    
        /** * 停止监听，注销广播 */
        public void unregister() {
            if (mRecevier != null) {
                mContext.unregisterReceiver(mRecevier);
            }
        }
    
    
        class HomeBroadcastReceiver extends BroadcastReceiver {
    
            final String SYSTEM_DIALOG_REASON_KEY = "reason";
            final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";
            final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";
    
            @Override
            public void onReceive(Context context, Intent intent) {
                String action = intent.getAction();
                if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
                    String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);
                    if (reason != null) {
                        if (mListener != null) {
                            if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {
                                // 短按home键
                                mListener.onHomePressed();
                            } else if (reason
                                    .equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {
                                // 长按home键
                                mListener.onHomeLongPressed();
                            }
                        }
                    }
                }
            }
        }
    }

--------------------

APP.java

#### 为避免在APP中重写过多的方法，通过一个类实现Application.ActivityLifecycleCallbacks接口 ####

public class APP extends Application { 
        private HomeWatch mHomeWatcher;
    
        @Override
        public void onCreate() {
            super.onCreate();
    
            regisiterActivityLifecycle();
        }
    
        private void regisiterActivityLifecycle() {
            registerActivityLifecycleCallbacks(new ActivityLifecycleCallBack() {
    
                @Override
                public void onActivityResumed(final Activity activity) {
                    super.onActivityResumed(activity);
                    mHomeWatcher = new HomeWatch(activity);
                    mHomeWatcher.setOnHomePressedListener(new HomeWatch.OnHomePressedListener() {
                        @Override
                        public void onHomePressed() {
                           //在此处实现具体逻辑
                        }
    
                        @Override
                        public void onHomeLongPressed() {
                            //在此处实现具体逻辑
                        }
                    });
                    mHomeWatcher.register();
                }
    
                @Override
                public void onActivityPaused(Activity activity) {
                    super.onActivityPaused(activity);
                    mHomeWatcher.setOnHomePressedListener(null);
                    mHomeWatcher.unregister();
                }
    
            });
        }
    }

--------------------

ActivityLifecycleCallBack.java

#### 自定义了一个类实现Application.ActivityLifecycleCallbacks的接口 ####

public class ActivityLifecycleCallBack implements Application.ActivityLifecycleCallbacks { 
    
            @Override
            public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
    
            }
    
            @Override
            public void onActivityStarted(Activity activity) {
    
            }
    
            @Override
            public void onActivityResumed(Activity activity) {
    
            }
    
            @Override
            public void onActivityPaused(Activity activity) {
    
            }
    
            @Override
            public void onActivityStopped(Activity activity) {
    
            }
    
            @Override
            public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
    
            }
    
            @Override
            public void onActivityDestroyed(Activity activity) {
    
            }
        }

在AndroidManifest.xml中