• 清单中里的设置

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    <activity android:name=".MainActivity">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN"/>
                </intent-filter>
     </activity>
     <activity-alias
                android:name=".maoyu"
                android:enabled="false"
                android:icon="@mipmap/maoyu"
                android:label="maoyu"
                android:targetActivity=".MainActivity">
      			<intent-filter>
                    <action android:name="android.intent.action.MAIN"/>
                    <category android:name="android.intent.category.LAUNCHER"/>
                </intent-filter>
      </activity-alias>
      <activity-alias
                android:name=".uu"
                android:enabled="true"
                android:icon="@mipmap/uu"
                android:label="uu"
                android:targetActivity=".MainActivity">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN"/>
                    <category android:name="android.intent.category.LAUNCHER"/>
                </intent-filter>
      </activity-alias>

    将原先的activity标签下的<category android:name="android.intent.category.LAUNCHER"/>删掉

    添加`标签

    android:name=”.uu” 随便起的名字

    android:enabled=”true” true表示默认就使用这个，桌面图标就是这个，应用名就是上面那个name

    android:icon=”@mipmap/uu” 下面两个不用解释了

    android:targetActivity=”.MainActivity”>

    上代码

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    private void switchIcon(boolean isUU) {
            try {
                //要跟manifest的activity-alias 的name保持一致  
                String maoyu = "com.aidebar.demo.maoyu";
                String uu = "com.aidebar.demo.uu";

                PackageManager pm = getPackageManager();
                ComponentName uuComponentName = new ComponentName(getApplicationContext(), uu);
                int uuState = isUU ? PackageManager.COMPONENT_ENABLED_STATE_ENABLED
                        : PackageManager.COMPONENT_ENABLED_STATE_DISABLED;
                //如果是UU，那么设置成enabled
                if (pm.getComponentEnabledSetting(uuComponentName) != uuState) {
                    pm.setComponentEnabledSetting(uuComponentName, uuState, 		 PackageManager.DONT_KILL_APP);
                }
                
                ComponentName maoyuComponentName = new ComponentName(getApplicationContext(), maoyu);
                //如果是UU，其他的都要设为disabled
                int maoyuState = !isUU ? PackageManager.COMPONENT_ENABLED_STATE_ENABLED
                        : PackageManager.COMPONENT_ENABLED_STATE_DISABLED;
                if (pm.getComponentEnabledSetting(maoyuComponentName) != maoyuState) {//新状态跟当前状态不一样才执行  
                    pm.setComponentEnabledSetting(maoyuComponentName, maoyuState, PackageManager.DONT_KILL_APP);
                }
            } catch (Exception e){
            }
        }

    可以在每次打开的时候判断下日期，如果是双十二啦，圣诞啦，就可以调用这方法，来改变应用图标啦，但是要注意试了几个测试机，都要十来秒才会有变化，在这十秒内点击桌面图标会出现该应用未正确安装的提示