[Android Studio] Chapter 14 연습문제

[연습문제]

4

activitiy_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnStart"
        android:text="음악서비스 시작"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnStop"
        android:text="음악서비스 중지"/>

</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.cookandroid.project14_1">

    <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/Theme.Project14_1">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name=".MusicService">
            <intent-filter>
                <action android:name="com.cookandroid.MusicService" />
            </intent-filter>
        </service>
    </application>

</manifest>

 

MainActivity.java

package com.cookandroid.project14_1;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    Intent intent;
    Button btnStart, btnStop;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("연습문제 14-4");

        ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE},MODE_PRIVATE);

        intent = new Intent(this, MusicService.class);
        btnStart = (Button) findViewById(R.id.btnStart);
        btnStop = (Button) findViewById(R.id.btnStop);

        btnStart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startService(intent);
                android.util.Log.i("서비스 테스트", "startService()");
                Toast.makeText(getApplicationContext(), "startService()", Toast.LENGTH_SHORT).show();
            }
        });

        btnStop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                stopService(intent);
                android.util.Log.i("서비스 테스트", "stopSevice()");
                Toast.makeText(getApplicationContext(), "stopSevice()", Toast.LENGTH_SHORT).show();
            }
        });
    }
}

MusicService.java

package com.cookandroid.project14_1;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Environment;
import android.os.IBinder;
import android.widget.Toast;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

public class MusicService extends Service {
    MediaPlayer mp;
    ArrayList<String> mp3List = new ArrayList<String>();
    int selectedMP3 = 0;

    String mp3Path = Environment.getExternalStorageDirectory().getPath()+"/";

    File[] listFiles = new File(mp3Path).listFiles();
    String fileName, extName;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        android.util.Log.i("서비스 테스트", "onCreate()");

        for (File file : listFiles){
            fileName = file.getName();
            extName = fileName.substring(fileName.length()-3);
            if(extName.equals((String)"mp3")){mp3List.add(fileName);}
        }
        Toast.makeText(getApplicationContext(), "onCreate()", Toast.LENGTH_SHORT).show();
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        android.util.Log.i("서비스 테스트", "onStartCommand()");
        Toast.makeText(getApplicationContext(), "onStartCommand()", Toast.LENGTH_SHORT).show();

        mp = new MediaPlayer();
        try {
            mp.setDataSource(mp3Path + mp3List.get(selectedMP3));
            mp.prepare();
        } catch (IOException e) {
            e.printStackTrace();
        }
        mp.start();

        mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp2) {
                mp.reset();
                if(selectedMP3>=mp3List.size()-1){
                    selectedMP3=0;
                    try {
                        mp.setDataSource(mp3Path + mp3List.get(selectedMP3));
                        mp.prepare();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    mp.start();
            }else{
                    selectedMP3++;
                    try {
                        mp.setDataSource(mp3Path + mp3List.get(selectedMP3));
                        mp.prepare();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    mp.start();
                }
            }
        });

        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        android.util.Log.i("서비스 테스트", "onDestroy()");
        Toast.makeText(getApplicationContext(), "onDestroy()", Toast.LENGTH_SHORT).show();
        mp.stop();
        mp.reset();
        super.onDestroy();
    }
}

 

 

1회독 끝! 근데 뭔가 아직 잘 정리된 기분은 아니라 다른 책들도 좀 봐야할 것 같다...