how to use queryIntentActivityOptions() method

Question

Am trying to create a dialog that shows all applications in a user phone that can be used to select a picture from the storage or take one using the camera. below are my two int

Answer 1

First, you need a good understanding of queryIntentActivityOptions() method of class PackageManager.

QueryIntentActivityOptions(ComponentName caller, Intent[] specifics,Intent intent, int flags)

• caller - This is the name of the class you are currently calling this method from. usually we use this.getComponentName as the value for this parameter.

• specifics - This is an array of intents that you want to be first resolved. for your case, you can put any of the two intents you have. i.e photoPickerIntent or takePictureIntent like this

  new Intent[] {takePicture}

  NOTE: this parameter value can be null if you have only one intent. in that case, i think it would be better to use QueryIntentActivities. but for your case, since you have more than one intent, continue using this method.

• intent - Here you place your desired intent. i.e between the two intents that you have, the one you desided not to put in the array because you so it as the most important one

  NOTE: this parameter value cannot be null. putting a null value will throw a NullPointerException!

• flags - This is like a filter or extra that you want to be included in any of the resolved activites returned by this method.

  • PackageManager.MATCH_DEFAULT_ONLY - puting this option will filter the resolved activities and select the activities that belong to default applications in your device.e.g if ACTION_IMAGE_CAPTURE can be resolved by two apps, one which is the default and the other is third party one, e.g you downloaded it, one the default will be selected

  • PackageManager.GET_INTENT_FILTERS - this option return information about all the intent filters that the resolved app can handle. e.g you can have an app that resolved ACTION_IMAGE_CAPTURE and yet it can also resolve ACTION_PICK

  • PackageManager.GET_RESOLVED_FILTER - this option return the intent filter that each of the apps in the list resolved

A WORKING EXAMPLE

Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);

Intent takePicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

photoPickerIntent.setType("image/*");

PackageManager pm=getPackageManager();


List launchables=pm.queryIntentActivityOptions(
 this.getComponentName(),new Intent[]{takePicture},
 photoPickerIntent,PackageManager.GET_RESOLVED_FILTER);

  Collections.sort(launchables,
    new ResolveInfo.DisplayNameComparator(pm));

You can then populate your listview using the above list of lauchaubles

 ListView lv=(ListView)dialog.findViewById(R.id.listView1);

 AppAdapter appAdapter=new AppAdapter(pm, launchables);

 lv.setAdapter(adapter);
 lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
 @Override
 public void onItemClick(AdapterView arg0, View arg1, int position,
                        long arg3) {
    // TODO Auto-generated method stub
    ResolveInfo launchable=appAdapter.getItem(position);
    ActivityInfo activity=launchable.activityInfo;
    ComponentName name=new ComponentName(activity.applicationInfo.packageName,
            activity.name);

 IntentFilter filter = launchable.filter;
        if(filter.actionsIterator() != null){
            Iterator actions = filter.actionsIterator();
        }

        int actioncode;
        Intent  intent = new Intent();
        Uri uri;
        if(filter.hasAction(Intent.ACTION_PICK)){
            actioncode = 1;
            uri = android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
            intent.setData(uri);
        }else{
            actioncode = 0;
        }
        intent.setComponent(name);
        startActivityForResult(intent,actioncode);

}
});

 }

class AppAdapter extends ArrayAdapter {

private PackageManager pm=null;

AppAdapter(PackageManager pm, List apps) {
super(Custom_chooser.this, R.layout.row, apps);
this.pm=pm;
}

 @Override
public View getView(int position, View convertView,
                ViewGroup parent) {
if (convertView==null) {
    convertView=newView(parent);
}

bindView(position, convertView);

return(convertView);
}

private View newView(ViewGroup parent) {
return(getLayoutInflater().inflate(R.layout.row, parent, false));
}

private void bindView(int position, View row) {
TextView label=(TextView)row.findViewById(R.id.label);

label.setText(getItem(position).loadLabel(pm));

ImageView icon=(ImageView)row.findViewById(R.id.icon);

icon.setImageDrawable(getItem(position).loadIcon(pm));
}
}