动态替换launcher icon

AndroidManifest.xml

<!-- activity -->
        <activity
            android:name=".ui.WelcomeActivity"
            android:label="@string/app_name"
            android:windowSoftInputMode="adjustResize|stateHidden" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
            </intent-filter>
        </activity>

        <activity-alias
            android:name=".ui.WelcomeActivity_Common"
            android:enabled="true"
            android:icon="@drawable/ic_launcher"
            android:label="@string/app_name"
            android:targetActivity=".ui.WelcomeActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity-alias>
        <activity-alias
            android:name=".ui.WelcomeActivity_MX2"
            android:enabled="false"
            android:icon="@drawable/ic_launcher_mx2"
            android:label="@string/app_name"
            android:targetActivity=".ui.WelcomeActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity-alias>

SetIcon.java

 private void setIcon(String activity_alias) {
        Context ctx = AppData.getContext();
        PackageManager pm = ctx.getPackageManager();
        ActivityManager am = (ActivityManager) ctx.getSystemService(Activity.ACTIVITY_SERVICE);

        // Enable/disable activity-aliases
        pm.setComponentEnabledSetting(
                new ComponentName(ctx, ACTIVITY_ALIAS_COMMON),
                ACTIVITY_ALIAS_COMMON.equals(activity_alias) ? PackageManager.COMPONENT_ENABLED_STATE_ENABLED
                        : PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
                PackageManager.DONT_KILL_APP);
        pm.setComponentEnabledSetting(
                new ComponentName(ctx, ACTIVITY_ALIAS_MX2),
                ACTIVITY_ALIAS_MX2.equals(activity_alias) ? PackageManager.COMPONENT_ENABLED_STATE_ENABLED
                        : PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
                PackageManager.DONT_KILL_APP);

        // Find launcher and kill it
        Intent i = new Intent(Intent.ACTION_MAIN);
        i.addCategory(Intent.CATEGORY_HOME);
        i.addCategory(Intent.CATEGORY_DEFAULT);
        List<ResolveInfo> resolves = pm.queryIntentActivities(i, 0);
        for (ResolveInfo res : resolves) {
            if (res.activityInfo != null) {
                am.killBackgroundProcesses(res.activityInfo.packageName);
            }
        }
    }