key components: AlertDialog, LayoutInflater, GridView, Adapter
General Conception
step 1: Put custom view in the dialog - Dialog, LayoutInflater.step 2: Manage your grid of options - GridView, Adapter.
Technical Conception
step 1: Use LayoutInflater to load the custom layout, which contains your GridView.step 2: Use your own Adapter to manage your GridView.
step 3: Define the behavior when users choose one of the options.
step 4: Use AlertDialog.Builder to set the view to the dialog as custom layout.
Practical steps
File used in this tutorial:
1. customdialog.xml: That is what will be shown in your dialog, add a GridView here.2. customcontent.xml: The format of every option in your grid, put an ImageView with any icon and a TextView under it.
note: You can choose another arrangement you want, I put the text under a icon here
3. customIconGridActivity.java: Your main activity.
4. main.xml: put a button to launch the function
5. Icons your wish to show on your options, store them under res/drawable
In this tutorial, I put three picture:cat.png, yao.png, and spider.png under res/drawable-mdpi
As a tutorial, I add all the object with Eclipse GUI and keep the default id such as imageView1, textView1, etc.
Code
customIconGridActivity.java-------------------------------------
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
/*
*
step 1: Use LayoutInflater to load the custom layout, which contains your GridView.
step 2: Use your own Adapter to manage your GridView.
step 3: Define the behavior when users choose one of the options.
step 4: Use AlertDialog.Builder to set the view to the dialog as custom layout.
*/
public class CustomIconGridActivity extends Activity {
Context m_context = this;
Dialog m_dialog;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button myButton = (Button) findViewById(R.id.button1);
myButton.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
// TODO Auto-generated method stub
showDialog(0);
}
});
}
@Override
protected Dialog onCreateDialog(int id) {
// TODO Auto-generated method stub
//step 1:Load custom dialog layout
LayoutInflater myInflater = LayoutInflater.from(m_context);
View myView = myInflater.inflate(R.layout.customdialog, null);
GridView gv = (GridView) myView.findViewById(R.id.gridView1);
//step 2: Set self-defined ImageAdaper to our gridview
gv.setAdapter(new ImageAdapter(m_context));
//step 3: Set up the behavior when user touches an item in the grid
gv.setOnItemClickListener(new GridView.OnItemClickListener(){
public void onItemClick(AdapterView<?> parent, View v,int position, long id)
{
// TODO Auto-generated method stub
Toast.makeText(v.getContext(), "Position is "+position, Toast.LENGTH_SHORT).show();
//remove this statement if you want keep the dialog after user touched
m_dialog.dismiss();
}
});
//step 4: Set the custom view to the AlertDialog
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("choose a context");
builder.setView(myView);
m_dialog = builder.create();
return m_dialog;
}
public class ImageAdapter extends BaseAdapter {
private Context mContext;
private LayoutInflater mInflater;
public ImageAdapter(Context c) {
mInflater = LayoutInflater.from(c);
mContext = c;
}
public int getCount() {
return mThumbIds.length;
}
public Object getItem(int position) {
return null;
}
public long getItemId(int position) {
return 0;
}
// create a new ImageView for each item referenced by the index
public View getView(int position, View convertView, ViewGroup parent) {
//ViewHolder is a self-defined class, and every instance is consisted of an icon and a text
ViewHolder holder;
if (convertView == null) { // if it's not recycled,
convertView = mInflater.inflate(R.layout.customcontent, null);
//convertView.setLayoutParams(new GridView.LayoutParams(90, 90));
holder = new ViewHolder();
//set any text and pic on the views, they will be replaced later
holder.title = (TextView) convertView.findViewById(R.id.textView1);
holder.icon = (ImageView )convertView.findViewById(R.id.imageView1);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.icon.setAdjustViewBounds(true);
//holder.icon.setScaleType(ImageView.ScaleType.CENTER_CROP);
holder.icon.setPadding(8, 8, 8, 8);
holder.title.setText(categoryContent[position]);
holder.icon.setImageResource(mThumbIds[position]);
return convertView;
}
class ViewHolder {
TextView title;
ImageView icon;
}
// references to our images
private Integer[] mThumbIds = {
R.drawable.spider, R.drawable.yao,R.drawable.cat,
R.drawable.spider, R.drawable.yao,R.drawable.cat,
R.drawable.yao
};
private String[] categoryContent = {
"spider0", "yao1", "cat2",
"spider3", "yao4", "cat5",
"yao6"
};
}
}
reference: http://iserveandroid.blogspot.com/2010/12/custom-gridview-in-dialog.html
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