Launch Twitter official client from Android through an Intent

gistfile1.java

Intent tweetIntent = new Intent(Intent.ACTION_SEND);
tweetIntent.putExtra(Intent.EXTRA_TEXT, "This is a Test.");
tweetIntent.setType("text/plain");
			
PackageManager packManager = getPackageManager();
List<ResolveInfo> resolvedInfoList = packManager.
        queryIntentActivities(tweetIntent, PackageManager.MATCH_DEFAULT_ONLY);

boolean resolved = false;
for(ResolveInfo resolveInfo: resolvedInfoList){
    if(resolveInfo.activityInfo.packageName.startsWith("com.twitter.android")){
        tweetIntent.setClassName(resolveInfo.activityInfo.packageName, 
                resolveInfo.activityInfo.name);
        resolved = true;
        break;
    }
}
if(resolved)
    startActivity(tweetIntent);
else
    Toast.makeText(this, "Twitter isn't found on your system", Toast.LENGTH_LONG).show();