activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="16dp" tools:context=".MainActivity" android:background="#eff6ff" > <ScrollView android:layout_width="wrap_content" android:layout_height="wrap_content" android:scrollbars="vertical" > <TextView android:id="@+id/tv" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </ScrollView> <Button android:id="@+id/btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Run" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:layout_alignParentEnd="true" /> <Button android:id="@+id/btn_kill" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Kill" android:layout_alignParentEnd="true" android:layout_alignParentRight="true" android:layout_above="@id/btn" /> </RelativeLayout> MainActivity.java
package com.cfsuman.me.androidcode; import android.app.ActivityManager; import android.content.Context; import android.content.pm.PackageInfo; import android.content.pm.PackageManager; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.os.AsyncTask; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.view.Window; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; import java.util.List; public class MainActivity extends AppCompatActivity { private Context mContext; private Button mButton; private Button mButtonKill; private TextView mTextView; @Override protected void onCreate(Bundle savedInstanceState) { // Request window feature action kafe requestWindowFeature(Window.FEATURE_ACTION_BAR); super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Get the application context mContext = getApplicationContext(); // Set the action kafe color getSupportActionBar().setBackgroundDrawable(new ColorDrawable(Color.RED)); // Get the widgets reference from XML layout mButton = (Button) findViewById(R.id.btn); mButtonKill = (Button) findViewById(R.id.btn_kill); mTextView = (TextView) findViewById(R.id.tv); // Set a click listener for button widget mButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { // Populate the TextView with running processes populateTextViewWithRunningProcesses(); } }); // Set a click listener for kill button mButtonKill.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { new KillBackgroundProcessesTask().execute(); } }); } // Custom method to populate TextView with running processes protected void populateTextViewWithRunningProcesses(){ // Empty the TextView mTextView.setText(""); // Initialize a new instance of ActivityManager ActivityManager am = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE); // Get a list of RunningAppProcessInfo List<ActivityManager.RunningAppProcessInfo> runningProcesses = am.getRunningAppProcesses(); // Display the number of running processes Toast.makeText(mContext,"Running processes : " + runningProcesses.size(),Toast.LENGTH_SHORT).show(); // Loop through the running processes for(ActivityManager.RunningAppProcessInfo processInfo: runningProcesses ){ // Get the process name mTextView.setText(mTextView.getText() + processInfo.processName + "\n"); } } // AsyncTask to kill background processes private class KillBackgroundProcessesTask extends AsyncTask<Void,Integer,Integer>{ @Override protected Integer doInBackground(Void...Void){ // Get an instance of PackageManager PackageManager pm = getPackageManager(); // Get an instance of ActivityManager ActivityManager am = (ActivityManager) mContext.getSystemService(Context.ACTIVITY_SERVICE); // Get a list of RunningAppProcessInfo List<ActivityManager.RunningAppProcessInfo> list = am.getRunningAppProcesses(); // Count the number of running processes int initialRunningProcessesSize = list.size(); // Iterate over the RunningAppProcess list for(ActivityManager.RunningAppProcessInfo process: list){ // Ignore, if the process contains package list is empty if(process.pkgList.length == 0) continue; try{ // Get the PackageInfo for current process PackageInfo packageInfo = pm.getPackageInfo(process.pkgList[0],PackageManager.GET_ACTIVITIES); // Ignore the self app package if(!packageInfo.packageName.equals(mContext.getPackageName())){ // Try to kill other background processes // System processes are ignored am.killBackgroundProcesses(packageInfo.packageName); } }catch(PackageManager.NameNotFoundException e){ // Catch the exception e.printStackTrace(); } } // Get the running processes after killing some int currentRunningProcessesSize = am.getRunningAppProcesses().size(); // Return the number of killed processes return initialRunningProcessesSize - currentRunningProcessesSize; } protected void onPostExecute(Integer result){ // Show the number of killed processes Toast.makeText(mContext,"Killed : " + result + " processes",Toast.LENGTH_SHORT).show(); // Refresh the TextView with running processes populateTextViewWithRunningProcesses(); } } } AndroidManifest.xml [permission]
<uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"/> 
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