Sunday, February 10, 2013

Implement own App Launcher

This example demonstrate how to implement our own App Launcher; list icons of installed App in GridView, and launchth the app once clicked.

our own App Launcher

Modify layout to XML to use GridView.
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/gridview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:numColumns="auto_fit"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:columnWidth="50dp"
android:stretchMode="columnWidth"
android:gravity="center"/>


Main Code.
package com.example.androidapplauncher;

import java.util.List;

import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;

public class MainActivity extends Activity {

PackageManager myPackageManager;

public class MyBaseAdapter extends BaseAdapter {

private Context myContext;
private List<ResolveInfo> MyAppList;

MyBaseAdapter(Context c, List<ResolveInfo> l){
myContext = c;
MyAppList = l;
}

@Override
public int getCount() {
return MyAppList.size();
}

@Override
public Object getItem(int position) {
return MyAppList.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

ImageView imageView;
if (convertView == null) {
// if it's not recycled, initialize some attributes
imageView = new ImageView(myContext);
imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setPadding(8, 8, 8, 8);
} else {
imageView = (ImageView)convertView;
}

ResolveInfo resolveInfo = MyAppList.get(position);
imageView.setImageDrawable(resolveInfo.loadIcon(myPackageManager));

return imageView;

}

}

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

myPackageManager = getPackageManager();

Intent intent = new Intent(Intent.ACTION_MAIN, null);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
List<ResolveInfo> intentList = getPackageManager().queryIntentActivities(intent, 0);

GridView gridview = (GridView) findViewById(R.id.gridview);
gridview.setAdapter(new MyBaseAdapter(this, intentList));

gridview.setOnItemClickListener(myOnItemClickListener);
}

OnItemClickListener myOnItemClickListener =
new OnItemClickListener(){

@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
ResolveInfo cleckedResolveInfo =
(ResolveInfo)parent.getItemAtPosition(position);
ActivityInfo clickedActivityInfo =
cleckedResolveInfo.activityInfo;

Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
intent.setClassName(
clickedActivityInfo.applicationInfo.packageName,
clickedActivityInfo.name);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |
Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
startActivity(intent);

}

};

}


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