Android包名跳转第三方app

当我们不知道对方具体Activity的时候，只知道包名的情况下可以这样

 private fun startPackageName(packagename: String) {

        // 通过包名获取此APP详细信息，包括Activities、services、versioncode、name等等
        var packageinfo: PackageInfo? = null
        try {
            packageinfo = packageManager.getPackageInfo(packagename, 0)
        } catch (e: PackageManager.NameNotFoundException) {
            e.printStackTrace()
        }
        if (packageinfo == null) {
            return
        }

        // 创建一个类别为CATEGORY_LAUNCHER的该包名的Intent
        val resolveIntent = Intent(Intent.ACTION_MAIN, null)
        resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER)
        resolveIntent.setPackage(packageinfo.packageName)

        // 通过getPackageManager()的queryIntentActivities方法遍历
        val resolveinfoList = packageManager
                .queryIntentActivities(resolveIntent, 0)

        val resolveinfo = resolveinfoList.iterator().next()
        if (resolveinfo != null) {
            // packagename = 参数packname
            val 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]
            val className = resolveinfo.activityInfo.name
            // LAUNCHER Intent
            val intent = Intent(Intent.ACTION_MAIN)
            intent.addCategory(Intent.CATEGORY_LAUNCHER)

            // 设置ComponentName参数1:packagename参数2:MainActivity路径
            val cn = ComponentName(packageName, className)

            intent.component = cn
            startActivity(intent)
        }
    }

Java代码

private void startPackageName(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 (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;  
        // 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);  
    }  
}