經(jīng)常聽到大家討論類似的需求，懷疑大廠是不是用了此方案，據(jù)我個(gè)人了解，多數(shù)頭部 app 其實(shí)都是發(fā)版來更新節(jié)假日的 icon。當(dāng)然本方案也是一種可選的方案，以前我也調(diào)研過，存在問題和作者所述差不多，此外原文鏈接作者也回復(fù)了很多疑問，可以同時(shí)了解。

效果圖

產(chǎn)品需求

市面上很多App能根據(jù)特定活動(dòng)，動(dòng)態(tài)切換應(yīng)用圖標(biāo)達(dá)到宣傳目的，例如淘寶雙十一，國(guó)慶節(jié)等等。那么我們?cè)鯓硬拍茉诓话l(fā)新版本的情況下，動(dòng)態(tài)切換應(yīng)用圖標(biāo)呢？

具體方案

1.圖標(biāo)更換：在AndroidManifest設(shè)置應(yīng)用入口Activity的別名，然后通過setComponentEnabledSetting動(dòng)態(tài)啟用或禁用別名進(jìn)行圖標(biāo)切換。

2.控制圖標(biāo)顯示：冷啟動(dòng)App時(shí)，調(diào)用接口判斷是否需要切換icon。

3.觸發(fā)時(shí)機(jī)：監(jiān)聽App前后臺(tái)切換，當(dāng)App處于后臺(tái)時(shí)切換圖標(biāo)，使得用戶無感知。

代碼實(shí)現(xiàn)

在AndroidManifest.xml中給入口Activity設(shè)置activity-alias

<applicationandroid:name=".MyApplication"android:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:supportsRtl="true"android:theme="@style/Theme.SwitchIcon"><!-- 原MainActivity --><activity android:name=".MainActivity" /><!-- 固定設(shè)置一個(gè)默認(rèn)的別名，用來替代原MainActivity --><activity-aliasandroid:name=".DefaultAliasActivity"android:enabled="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:targetActivity=".MainActivity"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity-alias><!-- 別名1，特定活動(dòng)需要的圖標(biāo)如：雙11，國(guó)慶節(jié)等 --><activity-aliasandroid:name=".Alias1Activity"android:enabled="false"android:icon="@mipmap/ic_launcher_show"android:label="@string/app_name"android:targetActivity=".MainActivity"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity-alias></application>

activity-alias標(biāo)簽中的屬性如下：

在MainActivity中，通過啟用或禁用別名進(jìn)行圖標(biāo)切換

/*** 設(shè)置默認(rèn)的別名為啟動(dòng)入口*/
public void setDefaultAlias() {PackageManager packageManager = getPackageManager();ComponentName name1 = new ComponentName(this, "com.fengfeibiao.switchicon.DefaultAliasActivity");packageManager.setComponentEnabledSetting(name1, PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);ComponentName name2 = new ComponentName(this, "com.fengfeibiao.switchicon.Alias1Activity");packageManager.setComponentEnabledSetting(name2, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);}/*** 設(shè)置別名1為啟動(dòng)入口*/
public void setAlias1() {PackageManager packageManager = getPackageManager();ComponentName name1 = new ComponentName(this, "com.fengfeibiao.switchicon.DefaultAliasActivity");packageManager.setComponentEnabledSetting(name1, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);ComponentName name2 = new ComponentName(this, "com.fengfeibiao.switchicon.Alias1Activity");packageManager.setComponentEnabledSetting(name2, PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);
}

ForegroundCallbacks監(jiān)聽App前后臺(tái)切換

/*** 監(jiān)聽App前后臺(tái)切換*/
public class ForegroundCallbacks implements Application.ActivityLifecycleCallbacks {public static final long CHECK_DELAY = 500;public static final String TAG = ForegroundCallbacks.class.getName();public interface Listener {void onForeground();void onBackground();}private static ForegroundCallbacks instance;private boolean foreground = false, paused = true;private Handler handler = new Handler();private List<Listener> listeners = new CopyOnWriteArrayList<Listener>();private Runnable check;public static ForegroundCallbacks init(Application application) {if (instance == null) {instance = new ForegroundCallbacks();application.registerActivityLifecycleCallbacks(instance);}return instance;}public static ForegroundCallbacks get(Application application) {if (instance == null) {init(application);}return instance;}public static ForegroundCallbacks get(Context ctx) {if (instance == null) {Context appCtx = ctx.getApplicationContext();if (appCtx instanceof Application) {init((Application) appCtx);}throw new IllegalStateException("Foreground is not initialised and " +"cannot obtain the Application object");}return instance;}public static ForegroundCallbacks get() {if (instance == null) {throw new IllegalStateException("Foreground is not initialised - invoke " +"at least once with parameterised init/get");}return instance;}public boolean isForeground() {return foreground;}public boolean isBackground() {return !foreground;}public void addListener(Listener listener) {listeners.add(listener);}public void removeListener(Listener listener) {listeners.remove(listener);}@Overridepublic void onActivityResumed(Activity activity) {paused = false;boolean wasBackground = !foreground;foreground = true;if (check != null)handler.removeCallbacks(check);if (wasBackground) {Log.d(TAG, "went foreground");for (Listener l : listeners) {try {l.onForeground();} catch (Exception exc) {Log.d(TAG, "Listener threw exception!:" + exc.toString());}}} else {Log.d(TAG, "still foreground");}}@Overridepublic void onActivityPaused(Activity activity) {paused = true;if (check != null)handler.removeCallbacks(check);handler.postDelayed(check = new Runnable() {@Overridepublic void run() {if (foreground && paused) {foreground = false;Log.d(TAG, "went background");for (Listener l : listeners) {try {l.onBackground();} catch (Exception exc) {Log.d(TAG, "Listener threw exception!:" + exc.toString());}}} else {Log.d(TAG, "still foreground");}}}, CHECK_DELAY);}@Overridepublic void onActivityCreated(Activity activity, Bundle savedInstanceState) {}@Overridepublic void onActivityStarted(Activity activity) {}@Overridepublic void onActivityStopped(Activity activity) {}@Overridepublic void onActivitySaveInstanceState(Activity activity, Bundle outState) {}@Overridepublic void onActivityDestroyed(Activity activity) {}
}

需要在Application中調(diào)用ForegroundCallbacks.init(this)進(jìn)行初始化。

在MainActivity中實(shí)現(xiàn)ForegroundCallbacks.Listener對(duì)App進(jìn)行監(jiān)聽，當(dāng)處于后臺(tái)判斷是否切換應(yīng)用圖標(biāo)

完整的MainActivity代碼：

public class MainActivity extends AppCompatActivity implements ForegroundCallbacks.Listener {private int position = 0;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//添加app前后臺(tái)監(jiān)聽ForegroundCallbacks.get(this).addListener(this);findViewById(R.id.tv_default).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {position = 0;}});findViewById(R.id.tv_alias1).setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {position = 1;}});}@Overrideprotected void onDestroy() {// 移除app前后臺(tái)監(jiān)聽ForegroundCallbacks.get(this).removeListener(this);super.onDestroy();}@Overridepublic void onForeground() {}@Overridepublic void onBackground() {//根據(jù)具體業(yè)務(wù)需求設(shè)置切換條件,我公司采用接口控制icon切換if (position == 0) {setDefaultAlias();} else {setAlias1();}}/*** 設(shè)置默認(rèn)的別名為啟動(dòng)入口*/public void setDefaultAlias() {PackageManager packageManager = getPackageManager();ComponentName name1 = new ComponentName(this, "com.fengfeibiao.switchicon.DefaultAliasActivity");packageManager.setComponentEnabledSetting(name1, PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);ComponentName name2 = new ComponentName(this, "com.fengfeibiao.switchicon.Alias1Activity");packageManager.setComponentEnabledSetting(name2, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);}/*** 設(shè)置別名1為啟動(dòng)入口*/public void setAlias1() {PackageManager packageManager = getPackageManager();ComponentName name1 = new ComponentName(this, "com.fengfeibiao.switchicon.DefaultAliasActivity");packageManager.setComponentEnabledSetting(name1, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);ComponentName name2 = new ComponentName(this, "com.fengfeibiao.switchicon.Alias1Activity");packageManager.setComponentEnabledSetting(name2, PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);}
}

具體缺陷

具體缺陷如下：

1. 切換icon會(huì)關(guān)閉應(yīng)用進(jìn)程，不是崩潰所以不會(huì)上報(bào)bugly。

2. 切換icon需要時(shí)間，部分華為機(jī)型要10s左右，之后能正常打開。

3. 切換icon過程中，部分機(jī)型點(diǎn)擊圖標(biāo)無法打開應(yīng)用，提示應(yīng)用未安裝。

Demo的github地址

https://github.com/FengFeiBiao/SwitchIcon