在应用中打开一个新的app

根据包名，我们可以在应用中启动另一个app

public class OpenAppUtils {
    /**
     * 根据包名切换到该应用
     */
    private static Intent getAppOpenIntentByPackageName(Context context, String packageName) {
        // MainActivity完整名
        String mainAct = null;
        // 根据包名寻找MainActivity
        PackageManager pkgMag = context.getPackageManager();
        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);
        intent.setFlags(Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED | Intent.FLAG_ACTIVITY_NEW_TASK);

        List<ResolveInfo> list = pkgMag.queryIntentActivities(intent, PackageManager.GET_ACTIVITIES);
        for (int i = 0; i < list.size(); i++) {
            ResolveInfo info = list.get(i);
            if (info.activityInfo.packageName.equals(packageName)) {
                mainAct = info.activityInfo.name;
                break;
            }
        }
        if (TextUtils.isEmpty(mainAct)) {
            return null;
        }
        intent.setComponent(new ComponentName(packageName, mainAct));
        return intent;
    }

    private static Context getPackageContext(Context context, String packageName) {
        Context pkgContext = null;
        if (context.getPackageName().equals(packageName)) {
            pkgContext = context;
        } else {
            // 创建第三方应用的上下文环境
            try {
                pkgContext = context.createPackageContext(packageName, Context.CONTEXT_IGNORE_SECURITY
                        | Context.CONTEXT_INCLUDE_CODE);
            } catch (PackageManager.NameNotFoundException e) {
                e.printStackTrace();
            }
        }
        return pkgContext;
    }

    public static boolean openPackage(Context context, String packageName) {
        Context pkgContext = getPackageContext(context, packageName);
        Intent intent = getAppOpenIntentByPackageName(context, packageName);
        if (pkgContext != null && intent != null) {
            pkgContext.startActivity(intent);
            return true;
        }
        Toast.makeText(context,"没有安装该应用",Toast.LENGTH_SHORT).show();
        return false;
    }
}