Create an application to read file from asset folder and copy it in memory card.


MainActivity.java

package com.example.assignment16;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

public class MainActivity extends AppCompatActivity {

    Button btnRead, btnMove;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        btnRead = (Button) findViewById(R.id.button1);

        btnRead.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                try {

                    BufferedReader myReader = new BufferedReader(new InputStreamReader(getAssets().open("mytext.txt")));

                    String aDataRow = "";

                    String aBuffer = "";

                    while ((aDataRow = myReader.readLine()) != null) {

                        aBuffer += aDataRow + "\n";

                    }

                    myReader.close();

                    Toast.makeText(getBaseContext(), "Data : " + aBuffer,

                            Toast.LENGTH_SHORT).show();

                } catch (Exception e) {

                    Toast.makeText(getBaseContext(), e.getMessage(), Toast.LENGTH_SHORT).show();

                }

            }

        });

        btnMove = (Button) findViewById(R.id.button2);

        btnMove.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                try {

                    String destPath = "/sdcard/mytext.txt";

                    File f = new File(destPath);

                    if (!f.exists()) {

                        CopyAsset(getBaseContext().getAssets().open("mytext.txt"), new FileOutputStream(destPath));

                    }

                    Toast.makeText(getBaseContext(),"Moved successfully", Toast.LENGTH_SHORT).show();

                } catch (Exception e) {

                    Toast.makeText(getBaseContext(), " " + e.toString(), Toast.LENGTH_LONG).show();

                }

            }

        });

    }

    private void CopyAsset(InputStream open, FileOutputStream fileOutputStream) throws IOException {

        {

            //---copy 1K bytes at a time---

            byte[] buffer = new byte[1024];

            int length;

           if ((length = open.read(buffer)) > 0) //check the length of file

            {

                fileOutputStream.write(buffer, 0, length);

            }

            open.close();

            fileOutputStream.close();

        }

    }

}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

<AbsoluteLayout 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">

    <Button

        android:id="@+id/button1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_x="-3dp"

        android:layout_y="241dp"

        android:text="Read File" />

    <Button

        android:id="@+id/button2"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_x="-4dp"

        android:layout_y="285dp"

        android:text="Move File To SD Card" />

</AbsoluteLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.assignment16">

    <uses-sdk android:minSdkVersion="8"></uses-sdk>

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE">

    </uses-permission>

    <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>

mytext.txt

Hello World!!

Output

To download follow this link : Program 16