android动态修改app桌面icon_android 手机qq动态换图标原理

实现原理：在Manifest文件中，使用标签为我们的入口Activity准备多个，拥有标签的activity是为了指向入口Activity，每个拥有标签的activity都可以单独设置一个icon，在程序中我们动态设置，然后kill掉launcher，等launcher重启后，icon就替换了注意：kill掉launcher需加权限代码：Manifest.xml:

<activity 
            android:name="com.dance.changeicondemo.MainActivity" 
            android:label="@string/app_name" > 
            <intent-filter> 
                <action android:name="android.intent.action.MAIN" /> 
            </intent-filter> 
        </activity> 
        <activity-alias 
            android:name="com.example.changeicondemo.ActivityAlias1" 
            android:enabled="true" 
            android:icon="@drawable/ic_launcher" 
            android:label="@string/app_name" 
            android:targetActivity="com.dance.changeicondemo.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="com.example.changeicondemo.ActivityAlias2" 
            android:enabled="false" 
            android:icon="@drawable/icon2" 
            android:label="@string/app_name" 
            android:targetActivity="com.dance.changeicondemo.MainActivity" > 
            <intent-filter> 
                <action android:name="android.intent.action.MAIN" /> 
                <category android:name="android.intent.category.LAUNCHER" /> 
            </intent-filter> 
        </activity-alias>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29

Java调用代码：

private void setIcon(String activity_alias) { 
        Context ctx = MyApplication.getContext(); 
        PackageManager pm = ctx.getPackageManager(); 
        ActivityManager am = (ActivityManager) ctx.getSystemService(Activity.ACTIVITY_SERVICE); 
    
        // Enable/disable activity-aliases 
        pm.setComponentEnabledSetting( 
                new ComponentName(ctx, ACTIVITY_ALIAS_1), 
                ACTIVITY_ALIAS_1.equals(activity_alias) ? PackageManager.COMPONENT_ENABLED_STATE_ENABLED 
                        : PackageManager.COMPONENT_ENABLED_STATE_DISABLED, 
                PackageManager.DONT_KILL_APP); 
        pm.setComponentEnabledSetting( 
                new ComponentName(ctx, ACTIVITY_ALIAS_2), 
                ACTIVITY_ALIAS_2.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); 
            } 
        } 
    }
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28