Get Memory Info at Runtime on Android tutorial for the SSaurel's Blog

MainActivity.java

public class MainActivity extends AppCompatActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   final TextView txt = (TextView) findViewById(R.id.txt);
   txt.setText(getMemoryInfo());
 }

 private String getMemoryInfo() {
   MemoryInfo memoryInfo = new MemoryInfo();
   ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
   activityManager.getMemoryInfo(memoryInfo);

   Runtime runtime = Runtime.getRuntime();

   String strMemInfo = 
       "Available Memory = " + memoryInfo.availMem + "\n"
       + "Total Memory = " + memoryInfo.totalMem + "\n"
       + "Runtime Max Memory = " + runtime.maxMemory() + "\n"
       + "Runtime Total Memory = " + runtime.totalMemory() + "\n"
       + "Runtime Free Memory = " + runtime.freeMemory() + "\n";

   return strMemInfo;
 }

}