How to get running process list and traffic statistics

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Today we got little application which displays list of working applications on Android in a ListView. When a process name is clicked application displays information about amount of data that application used – traffic info. We present following topics here:
- Display data in a form of ListView
- Display process list and their traffic statistics

Display data in a form of ListView

We want an icon and text to display in a ListView. Our layout looks like this.

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#000">

    <ImageView
        android:id="@+id/detailsIco"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_action_search" />
    
    <TextView
        android:id="@+id/appNameText"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="APP NAME GOES HERE">
    </TextView>
</LinearLayout>

Next we need a ListAdapter which is responsible for building a list raw.

ListAdapter.java

package com.itcuties.apps.TransferUsageApp.adapters;

import java.util.List;

import android.app.ActivityManager.RunningAppProcessInfo;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

import com.itcuties.apps.TransferUsageApp.R;

public class ListAdapter extends ArrayAdapter<RunningAppProcessInfo> {
	// List context
	private final Context context;
	// List values
	private final List<RunningAppProcessInfo> values;

	public ListAdapter(Context context, List<RunningAppProcessInfo> values) {
		super(context, R.layout.main, values);
		this.context = context;
		this.values = values;
	}

	
	/**
	 * Constructing list element view
	 */
	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		
		LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

		View rowView = inflater.inflate(R.layout.main, parent, false);
		
		TextView appName = (TextView) rowView.findViewById(R.id.appNameText);
		appName.setText(values.get(position).processName);
		
		return rowView;
	}	
}

Display process list and their traffic statistics

Now we are ready to display processes and traffic information. Since we use ListView and which is responsive our activity will extend ListActivity to add functionality of performing action when an item is clicked – we override onListItemClick method.

MainActivity.java

package com.itcuties.apps.TransferUsageApp;

import java.util.List;

import android.app.ActivityManager;
import android.app.ActivityManager.RunningAppProcessInfo;
import android.app.ListActivity;
import android.net.TrafficStats;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.widget.Toast;

import com.itcuties.apps.TransferUsageApp.adapters.ListAdapter;

public class MainActivity extends ListActivity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		// Get running processes
		ActivityManager manager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
		List<RunningAppProcessInfo> runningProcesses = manager.getRunningAppProcesses();
		if (runningProcesses != null && runningProcesses.size() > 0) {
			// Set data to the list adapter
			setListAdapter(new ListAdapter(this, runningProcesses));
		} else {
			// In case there are no processes running (not a chance :))
			Toast.makeText(getApplicationContext(), "No application is running", Toast.LENGTH_LONG).show();
		}

	}
	
	@Override
	protected void onListItemClick(ListView l, View v, int position, long id) {
		long send 		= 0;
		long recived 	= 0;
		// Get UID of the selected process
		int uid = ((RunningAppProcessInfo)getListAdapter().getItem(position)).uid;
		
		// Get traffic data
		recived = TrafficStats.getUidRxBytes(uid);
		send = TrafficStats.getUidTxBytes(uid);
		
		// Display data
		Toast.makeText(getApplicationContext(), "UID " + uid + " details...\n send: " + send/1000 + "kB" + " \n recived: " + recived/1000 + "kB", Toast.LENGTH_LONG).show();
	}

}

Full code of this application is available here.