android在只拥有第三方apk的情况下在自己app中打开第三方app

前提是第三方apk的AndroidManifest的某个activity中的export = "true"

/**     *     * 打开另一个app     * @param packageName     * @param className     */    public void goToAnotherApp(String packageName,String className){        Intent intent = new Intent();        if(isAvilible(Main2Activity.this,packageName)){            intent.setAction(Intent.ACTION_MAIN);            //前提：知道要跳转应用的包名、类名            ComponentName componentName = new ComponentName(packageName, className);            intent.setComponent(componentName);            startActivity(intent);        }else{            Toast.makeText(Main2Activity.this, "没有该应用", Toast.LENGTH_SHORT).show();        }    }    /**     * 判断相对应的APP是否存在     *     * @param context     * @param packageName(包名)(若想判断QQ，则改为com.tencent.mobileqq，若想判断微信，则改为com.tencent.mm)     * @return     */    public boolean isAvilible(Context context, String packageName) {        PackageManager packageManager = context.getPackageManager();        //获取手机系统的所有APP包名，然后进行一一比较        List pinfo = packageManager.getInstalledPackages(0);        for (int i = 0; i < pinfo.size(); i++) {            if (((PackageInfo) pinfo.get(i)).packageName                    .equalsIgnoreCase(packageName))                return true;        }        return false;    }    /**     * 通过已知apk获取到该app的包名     */    private void getPackageNameByApk() {        String FilePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "xinga.apk";//输入APK地址        PackageManager pm = getPackageManager();        PackageInfo info = pm.getPackageArchiveInfo(FilePath, PackageManager.GET_ACTIVITIES);        if (info != null) {            ApplicationInfo appInfo = info.applicationInfo;            String appName = pm.getApplicationLabel(appInfo).toString();            String packageName = appInfo.packageName;  //获取安装包名称//            com.travelsky.mrt.oneetrip//            com.travelsky.mrt.oneetrip.common.WelcomeActivity            Log.i("Abel_Test", "包名是：" + packageName);            String version = info.versionName; //获取版本信息            Log.i("Abel_Tes", "版本信息：" + version);        }    }    /**     * 通过包名获取app详细信息     * @param packagename     */    private void doStartApplicationWithPackageName(String packagename) {        // 通过包名获取此APP详细信息，包括Activities、services、versioncode、name等等        PackageInfo packageinfo = null;        try {            packageinfo = getPackageManager().getPackageInfo(packagename, 0);        } catch (PackageManager.NameNotFoundException e) {            e.printStackTrace();        }        if (packageinfo == null) {            return;        }        // 创建一个类别为CATEGORY_LAUNCHER的该包名的Intent        Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);        resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);        resolveIntent.setPackage(packageinfo.packageName);        // 通过getPackageManager()的queryIntentActivities方法遍历        List resolveinfoList = getPackageManager()                .queryIntentActivities(resolveIntent, 0);        ResolveInfo resolveinfo = resolveinfoList.iterator().next();        if (resolveinfo != null) {            // packagename = 参数packname            String packageName = resolveinfo.activityInfo.packageName;            // 这个就是我们要找的该APP的LAUNCHER的Activity[组织形式：packagename.mainActivityname]            String className = resolveinfo.activityInfo.name;            Log.i("Abel_Tes", "版本信息：" + className);            // LAUNCHER Intent            Intent intent = new Intent(Intent.ACTION_MAIN);            intent.addCategory(Intent.CATEGORY_LAUNCHER);            // 设置ComponentName参数1:packagename参数2:MainActivity路径            ComponentName cn = new ComponentName(packageName, className);            intent.setComponent(cn);            startActivity(intent);        }    }

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