android - 从Android应用程序打开Gmail

我正在尝试创建一个可以打开Gmail的应用程序。我使用两个函数：startApplication和launchApp：

public void startApplication(String packageName){
            try
            {
                Intent intent = new Intent("android.intent.action.MAIN");
                intent.addCategory("android.intent.category.LAUNCHER");
                intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
                List<ResolveInfo> resolveInfoList = getPackageManager().queryIntentActivities(intent, 0);

                for(ResolveInfo info : resolveInfoList)
                    if(info.activityInfo.packageName.equalsIgnoreCase(packageName))
                    {
                        toast = Toast.makeText(MainActivity.this, "Gmail opened", Toast.LENGTH_LONG);
                        toast.show();
                        launchApp(info.activityInfo.packageName, info.activityInfo.name);
                        return;
                    }
            }
            catch (Exception e)
            {
                toast = Toast.makeText(MainActivity.this, "Can't find Gmail", Toast.LENGTH_LONG);
                toast.show();
            }
        }

这是launchApp函数：

private void launchApp(String packageName, String name)
    {
        Intent intent = new Intent("android.intent.action.MAIN");
        intent.addCategory("android.intent.category.LAUNCHER");
        intent.setComponent(new ComponentName(packageName, name));
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(intent);
    }

我从MainActivity的onCreate函数调用


  startApplication（“ com.gmail”）;


我尝试在模拟器和智能手机上运行此应用程序，但是程序崩溃。有什么错误？

最佳答案

最后，我解决了使用startApplication("com.gmail")更改startApplication("com.google.android.gm")的问题