Service IntentService Android中的线程 MediaPlayer

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在Service中添加线程

注意服务是需要注册的
流程示意图

public class MyService extends Service {    private int count;    @Override    public void onCreate() {        super.onCreate();        Log.d("", "onCreate");    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        Log.d("","onStartCommand");        new Thread(new Runnable() {            @Override            public void run() {                while (count<100){                    count++;                    Intent intent = new Intent();                    intent.setAction(MainActivity.DOWN_LOAD_ACTION);                    intent.putExtra("count", count);                    sendBroadcast(intent);                    try {                        Thread.sleep(200);                    } catch (InterruptedException e) {                        e.printStackTrace();                    }                }            }        }).start();        return super.onStartCommand(intent, flags, startId);    }    @Override    public void onDestroy() {        super.onDestroy();        Log.d("", "onDestroy");    }    @Override    public IBinder onBind(Intent intent) {        return null;    }}

public class MainActivity extends Activity implements View.OnClickListener {    public static final String DOWN_LOAD_ACTION ="com.service.test" ;    private ProgressBar mProgressbar;    private Button mButtonDownload;    private Button mButtonStop;    private MyReceiver myReceiver;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        myReceiver = new MyReceiver();        IntentFilter filter = new IntentFilter();        filter.addAction(DOWN_LOAD_ACTION);        registerReceiver(myReceiver, filter);        mProgressbar = (ProgressBar) findViewById(R.id.progressbar_download);        mProgressbar.setOnClickListener(this);        mButtonDownload = (Button) findViewById(R.id.button_download);        mButtonStop = (Button) findViewById(R.id.button_stop);        mButtonDownload.setOnClickListener(this);        mButtonStop.setOnClickListener(this);    }    @Override    public void onClick(View view) {        switch (view.getId()){            case R.id.button_stop:                Intent intent1 = new Intent(getApplicationContext(),MyIntentService.class);                stopService(intent1);                break;            case R.id.button_download:                Intent intent = new Intent(getApplicationContext(),MyIntentService.class);                startService(intent);                break;            default:                break;        }    }    @Override    protected void onDestroy() {        super.onDestroy();        unregisterReceiver(myReceiver);    }    public class MyReceiver extends BroadcastReceiver {        @Override        public void onReceive(Context context, Intent intent) {            int count = intent.getIntExtra("count",0);            mProgressbar.setProgress(count);        }    }}

利用IntentService添加线程，因为其自身包含一个线程，所以不用new Thread一个线程

public class MyIntentService extends IntentService {    private int count;    public MyIntentService(String name) {        super(name);//调用父类的有参构造函数    }    public MyIntentService(){        this("");    }    @Override    public void onDestroy() {        super.onDestroy();        Log.d("MyIntentService","服务关闭");    }    @Override    protected void onHandleIntent(Intent intent) {        Log.d("MyIntentService","运行到IntentService");        while (true){            if (count>100){                count=0;            }            count++;            Intent intent2 = new Intent();            intent2.setAction(MainActivity.DOWN_LOAD_ACTION);            intent2.putExtra("count", count);            sendBroadcast(intent2);            try {                Thread.sleep(200);            } catch (InterruptedException e) {                e.printStackTrace();            }        }    }}

Android中的进程、线程

加入新的进程有两种方法handler asynctask

handler

子线程给主线程发消息

方法一：

public class MainActivity extends Activity {    private Button mButton;    private int count = 60;    public static final int TIME_DESC =0x23 ;    private MyHandler handler = new MyHandler();    class MyHandler extends Handler{        @Override        public void handleMessage(Message msg) {            switch (msg.what){                case TIME_DESC:                    count--;                    mButton.setText(count+"秒");                    if (count>0){                        try {                            Thread.sleep(1000);                        } catch (InterruptedException e) {                            e.printStackTrace();                        }                        handler.sendEmptyMessage(TIME_DESC);                    }                    break;            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mButton = (Button) findViewById(R.id.button);        mButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                count = 60;                handler.sendEmptyMessage(TIME_DESC);            }        });    }}

方法二：

public class MainActivity extends Activity {    private Button mButton;    private int count = 60;    public static final int TIME_DESC =0x23 ;    private MyHandler handler = new MyHandler();    class MyHandler extends Handler{        @Override        public void handleMessage(Message msg) {            switch (msg.what){                case TIME_DESC:                    String time = (String) msg.obj;                    mButton.setText(time);                    break;            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mButton = (Button) findViewById(R.id.button);        mButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                count = 60;                new Thread(new Runnable() {                    @Override                    public void run() {                        while (count>0){                            count--;                            try {                                Thread.sleep(1000);                            } catch (InterruptedException e) {                                e.printStackTrace();                            }                            Message msg = new Message();                            msg.obj = count+"秒";                            msg.what = TIEM_DESC;                            handler.sendMessage(msg);                        }                    }                }).start();            }        });    }   }

主线程给子线程发消息

基本不这么用，

public class MainActivity extends Activity {    private Button mButton;    private Button mButton2;    private int count = 60;    public static final int TIME_DESC =0x23 ;    private Handler handler;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mButton = (Button) findViewById(R.id.button);        mButton2 = (Button) findViewById(R.id.button2);        mButton2.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                handler.sendEmptyMessage(0);            }        });        mButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                count = 60;                MyThread thread = new MyThread();                thread.start();            }        });    }    class MyThread extends Thread{        @Override        public void run() {            Looper.prepare();            handler = new Handler(){                @Override                public void handleMessage(Message msg) {                    Log.d("handler","接受主线程的消息");                    super.handleMessage(msg);                }            };            Looper.loop();        }    }}

AsyncTask

public class MainActivity extends Activity {    private Button mButton;    private ProgressBar mProgressbar;    private int count = 0;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mButton = (Button) findViewById(R.id.button);        mProgressbar = (ProgressBar) findViewById(R.id.progressbar);        mButton.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                MyTast tast = new MyTast();                tast.execute("去执行");//用execute()方法调用            }        });    }    class MyTast extends AsyncTask<String,String,String>{        @Override        protected void onPostExecute(String s) {//运行结束            super.onPostExecute(s);            mButton.setText(s);        }        @Override        protected void onProgressUpdate(String... values) {//中间运行            super.onProgressUpdate(values);            int count = Integer.parseInt(values[0]);            mProgressbar.setProgress(count);        }        @Override        protected String doInBackground(String... strings) {//开始运行            while (count<101){                count++;                publishProgress(""+count);                try {                    Thread.sleep(200);                } catch (InterruptedException e) {                    e.printStackTrace();                }                Log.d("",""+count);            }            return "执行结束";//返回onPostExecute 中的s值        }    }}

MediaPlayer

public class MainActivity extends Activity {    private Button mButtonStartMusic;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mButtonStartMusic = (Button) findViewById(R.id.button_music);        mButtonStartMusic.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                MediaPlayer mediaPlayer = new MediaPlayer();                mediaPlayer.reset();                Log.d("","文件路径"+Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC));                File musicDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC);                File[] files = musicDir.listFiles();                try {                    mediaPlayer.setDataSource(files[0].getAbsolutePath());                    mediaPlayer.prepare();                    mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {                        @Override                        public void onPrepared(MediaPlayer mediaPlayer) {                            mediaPlayer.start();                        }                    });                } catch (IOException e) {                    e.printStackTrace();                }            }        });    }}

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