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How to check the amount of RAM to be used by an Android App?
This example demonstrates how do I check the amount of RAM to be used by an android app.
Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/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="8dp" tools:context=".MainActivity"> <TextView android:id="@+id/text" android:textStyle="bold" android:textSize="24sp" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" /> </RelativeLayout>
Step 3 − Add the following code to src/MainActivity.java
import android.app.ActivityManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final TextView textView = findViewById(R.id.text);
textView.setText(getMemoryInfo());
}
private String getMemoryInfo() {
ActivityManager.MemoryInfo memoryInfo = new ActivityManager.MemoryInfo();
ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
activityManager.getMemoryInfo(memoryInfo);
Runtime runtime = Runtime.getRuntime();
StringBuilder builder = new StringBuilder();
builder.append("Available Memory: ").append(memoryInfo.availMem).append("
").
append("Total Memory: ").append(memoryInfo.totalMem).append("
").
append("Runtime Maximum Memory: ").append(runtime.maxMemory()).append("
").
append("Runtime Total Memory: ").append(runtime.totalMemory()).append("
").
append("Runtime Free Memory: ").append(runtime.freeMemory()).append("
");
return builder.toString();
}
}Step 4 - Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run 
icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –
Click here to download the project code.
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