做过launcher的朋友都知道，有一些应用是有多个入口的。我们需要把所有入口都显示在桌面上。

如何获取桌面应用程序

/**
     * 获取能在桌面上使用得app
     *
     * @return
     */
    public static List<ResolveInfo> getIntentActivity() {
        Intent intent = new Intent();
        intent.addCategory(Intent.CATEGORY_LAUNCHER);
        intent.setAction(Intent.ACTION_MAIN);

        PackageManager manager = MyApplication.getContext().getApplicationContext().getPackageManager();
        List<ResolveInfo> resolveInfos = manager.queryIntentActivities(intent, 0);
        return resolveInfos;
    }

如何获取桌面图标 包名 应用名字以及入口Activity（入口activity是关键）

Drawable drawable = info.loadIcon(packageManager);//图标
                    String name = info.loadLabel(packageManager).toString();//应用名
                    String packageName = info.activityInfo.packageName;//包名
                    String targetActivity = info.activityInfo.name;//入口activity 绝对路径（不是targetActivity）

如何打开第三方应用

平常我们只通过包名打开的话 永远只能打开第一个入口activity

//这里我们不用这个
public static void startAppByPackageName(String packageName) {
        PackageManager packageManager = MyApplication.getContext().getApplicationContext().getPackageManager();
        if (checkPackInfo(packageName)) {
            Intent intent = packageManager.getLaunchIntentForPackage(packageName);
            MyApplication.getContext().getApplicationContext().startActivity(intent);
        } else {
            MyApplication.showToast(MyApplication.getContext().getApplicationContext().getString(R.string.str_not_install));
        }
    }

想打开不同的入口用这个

public static void startTargetActivity(String packageName, String targetActivity) {
        Intent intent = new Intent();
        ComponentName cn = new ComponentName(packageName, targetActivity);
        try {
            intent.setComponent(cn);
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);//别忘了这个
//18.03.23更新
intent.addFlags(Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED); //launcher系统launcher会添加这个
            MyApplication.getContext().getApplicationContext().startActivity(intent);
        } catch (Exception e) {
            e.printStackTrace();
            MyApplication.showToast(MyApplication.getContext().getApplicationContext().getString(R.string.str_not_install));
        }
    }