利用android的服務給android添加BGM

1.新建資源文件夾

在res目錄下新建一個raw文件夾,把mp3文件存到該文件夾下.注意名稱必須是小寫,不然要報錯.

下面為android studio自動創建.

 

 

 

 2.新建java class類繼承 IntentService

代碼:

package chenlong.chenlong.bgm;
import android.app.IntentService;
import android.content.Intent;
import android.media.MediaPlayer;
import android.util.Log;


/**
 * An {@link IntentService} subclass for handling asynchronous task requests in
 * a service on a separate handler thread.
 * <p>
 * TODO: Customize class - update intent actions and extra parameters.
 */
public class MyIntentService extends IntentService {
    // TODO: Rename actions, choose action names that describe tasks that this
    // IntentService can perform, e.g. ACTION_FETCH_NEW_ITEMS
    public static final String ACTION_FOO = "com.example.zouqi.bgmusicdemo.action.FOO";
    public static final String ACTION_BAZ = "com.example.zouqi.bgmusicdemo.action.BAZ";

    // action聲明
    public static final String ACTION_MUSIC = "com.example.zouqi.bgmusicdemo.action.music";

    // TODO: Rename parameters
    public static final String EXTRA_PARAM1 = "com.example.zouqi.bgmusicdemo.extra.PARAM1";
    public static final String EXTRA_PARAM2 = "com.example.zouqi.bgmusicdemo.extra.PARAM2";

    // 聲明MediaPlayer對象
    private MediaPlayer mediaPlayer;

    public MyIntentService() {
        super("MyIntentService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        if (intent != null) {
            final String action = intent.getAction();
            if (ACTION_FOO.equals(action)) {
                final String param1 = intent.getStringExtra(EXTRA_PARAM1);
                final String param2 = intent.getStringExtra(EXTRA_PARAM2);
                handleActionFoo(param1, param2);
            } else if (ACTION_BAZ.equals(action)) {
                final String param1 = intent.getStringExtra(EXTRA_PARAM1);
                final String param2 = intent.getStringExtra(EXTRA_PARAM2);
                handleActionBaz(param1, param2);
            }

            // 根據intent設置的action來執行對應服務的操作
            if (ACTION_MUSIC.equals(action)){
                handleActionMusic();
            }
        }
    }

    /**
     * 該服務執行的操作用來播放背景音樂
     */
    private void handleActionMusic() {

        if (mediaPlayer == null){
            // 根據音樂資源文件創建MediaPlayer對象 設置循環播放屬性 開始播放
            mediaPlayer = MediaPlayer.create(this,R.raw.a);
            mediaPlayer.setLooping(true);
            mediaPlayer.start();
        }

    }

    /**
     * Handle action Foo in the provided background thread with the provided
     * parameters.
     */
    private void handleActionFoo(String param1, String param2) {
        // TODO: Handle action Foo
        throw new UnsupportedOperationException("Not yet implemented");
    }

    /**
     * Handle action Baz in the provided background thread with the provided
     * parameters.
     */
    private void handleActionBaz(String param1, String param2) {
        // TODO: Handle action Baz
        throw new UnsupportedOperationException("Not yet implemented");
    }
}

3.MainActivity代碼

package chenlong.chenlong.bgm;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    private MediaPlayer mMediaPlayer;
    Intent intent;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 啟動服務播放背景音樂
        intent = new Intent(MainActivity.this, MyIntentService.class);
        String action = MyIntentService.ACTION_MUSIC;
        // 設置action
        intent.setAction(action);
        startService(intent);

    }




}