How to read a file from assets on android?

This example demonstrates how do I read a file from assets in android.

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"
   tools:context=".MainActivity">
   <TextView
      android:id="@+id/textView"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_centerInParent="true"
      android:padding="12sp"
      android:textStyle="bold"/>
   <Button
      android:id="@+id/btnReadText"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Read text from assets"
      android:layout_centerHorizontal="true"
      android:layout_marginTop="20sp"
      android:textStyle="bold">
   </Button>
</RelativeLayout>

Step 3 – Right click app >> New >> Folder >> Assets folder. Right click on the assets folder, select New >> file (myText.txt) and your text.

“Darkness cannot drive out darkness: only light can do that. Hate cannot drive out hate: only love can do that.”

Step 4 − Add the following code to src/MainActivity.java

package app.com.sample;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.io.IOException;
import java.io.InputStream;
public class MainActivity extends AppCompatActivity{
   TextView textView;
   Button button;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      textView = findViewById(R.id.textView);
      button = findViewById(R.id.btnReadText);
      button.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            String string = "";
            try {
               InputStream inputStream = getAssets().open("myText.txt");
               int size = inputStream.available();
               byte[] buffer = new byte[size];
               inputStream.read(buffer);
               string = new String(buffer);
            } catch (IOException e) {
               e.printStackTrace();
            }
            textView.setText(string);
         }
      });
   }
}

Step 5 − 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.

Azhar

Published on 30-Aug-2019 10:48:46