[Android Studio] Chapter 14 직접 풀어보기

[직접 풀어보기]

 

1

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 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("서비스 테스트 예제(개선)");

        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();
                finish();
            }
        });

        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.IBinder;
import android.widget.Toast;

public class MusicService extends Service {
    MediaPlayer mp;
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        android.util.Log.i("서비스 테스트", "onCreate()");
        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=MediaPlayer.create(this,R.raw.song1);
        mp.setLooping(true);
        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();
        super.onDestroy();
    }
}

 

 

 

2

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"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:id="@+id/ivBattery"
        android:src="@drawable/battery0"/>
    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/edtBattery"
        android:enabled="false"/>

</LinearLayout>

 

MainActivity.java

package com.cookandroid.project14_2;

import androidx.appcompat.app.AppCompatActivity;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.media.Image;
import android.os.BatteryManager;
import android.os.Bundle;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    ImageView ivBattery;
    EditText edtBattery;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        setTitle("배터리 상태 체크");

        ivBattery=(ImageView)findViewById(R.id.ivBattery);
        edtBattery=(EditText)findViewById(R.id.edtBattery);
    }

    BroadcastReceiver br = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();

            if(action.equals(Intent.ACTION_BATTERY_CHANGED)){
                int remain = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
                edtBattery.setText("현재 충전량 : " + remain + "%\n");

                if (remain>=90) ivBattery.setImageResource(R.drawable.battery100);
                else if (remain>=70) ivBattery.setImageResource(R.drawable.battery80);
                else if (remain>=50) ivBattery.setImageResource(R.drawable.battery60);
                else if (remain>=10) ivBattery.setImageResource(R.drawable.battery20);
                else ivBattery.setImageResource(R.drawable.battery0);

                int plug = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0);
                switch (plug){
                    case 0:
                        edtBattery.append("전원 연결 : 안됨");
                        break;
                    case 1:
                        edtBattery.append("전원 연결 : 어댑터 연결됨");
                        break;
                    case 2:
                        edtBattery.append("전원 연결 : USB 연결됨");
                        break;
                }

                int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS, 0);
                switch (status){
                    case BatteryManager.BATTERY_STATUS_CHARGING:
                        Toast.makeText(getApplicationContext(), "배터리 상태: 현재 충전중임", Toast.LENGTH_SHORT).show();
                        break;
                    case BatteryManager.BATTERY_STATUS_DISCHARGING:
                        Toast.makeText(getApplicationContext(), "배터리 상태: 현재 방전됨", Toast.LENGTH_SHORT).show();
                        break;
                    case BatteryManager.BATTERY_STATUS_FULL :
                        Toast.makeText(getApplicationContext(), "배터리 상태: 100% 충전됨", Toast.LENGTH_SHORT).show();
                        break;
                    case BatteryManager.BATTERY_STATUS_NOT_CHARGING :
                        Toast.makeText(getApplicationContext(), "배터리 상태: 현재 충전중이 아님", Toast.LENGTH_SHORT).show();
                        break;
                    default :
                        Toast.makeText(getApplicationContext(), "배터리 상태: 알 수 없음", Toast.LENGTH_SHORT).show();
                        break;

                }
            }
        }
    };

    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(br);
    }

    @Override
    protected void onResume() {
        super.onResume();
        IntentFilter iFilter = new IntentFilter();
        iFilter.addAction(Intent.ACTION_BATTERY_CHANGED);
        registerReceiver(br, iFilter);
    }
}