Android Service中方法使用详细介绍

public class MyIntentService extends IntentService {
public MyIntentService() {
super("MyIntentService");
}
@Override
protected void onHandleIntent(Intent intent) {
// IntentService会使用单独的线程来执行该方法的代码
// 该方法内执行耗时任务，比如下载文件，此处只是让线程等待20秒
long endTime = System.currentTimeMillis() + 20 * 1000;
System.out.println("onStart");
while (System.currentTimeMillis() < endTime) {
synchronized (this) {
try {
wait(endTime - System.currentTimeMillis());
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
System.out.println("----耗时任务执行完成---");
}
}

public class MainActivity extends Activity implements OnClickListener {
private Button startService;
private Button stopService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
startService = (Button) findViewById(R.id.start_service);
stopService = (Button) findViewById(R.id.stop_service);
startService.setOnClickListener(this);
stopService.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.start_service:
Intent startIntent = new Intent(this, MyService.class);
startService(startIntent);
break;
case R.id.stop_service:
Intent stopIntent = new Intent(this, MyService.class);
stopService(stopIntent);
break;
default:
break;
}
}

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
……
<service android:name="com.example.servicetest.MyService" >
</service>
</application>

public class LocalService extends Service {
// Binder given to clients
private final IBinder mBinder = new LocalBinder();
// Random number generator
private final Random mGenerator = new Random();
public class LocalBinder extends Binder {
LocalService getService() {
// 返回本service的实例到客户端，于是客户端可以调用本service的公开方法
return LocalService.this;
}
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
/**客户端所要调用的方法*/
public int getRandomNumber() {
return mGenerator.nextInt(100);
}
}

public class BindingActivity extends Activity {
LocalService mService;
boolean mBound = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
@Override
protected void onStart() {
super.onStart();
// 绑定到类LocalService的实例
Intent intent = new Intent(this, LocalService.class);
bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
}
@Override
protected void onStop() {
super.onStop();
// 从service解除绑定
if (mBound) {
unbindService(mConnection);
mBound = false;
}
}
/** 当按钮按下时调用(在layout文件中定义的button并用android:onClick 属性指定响应到本方法) */
public void onButtonClick(View v) {
if (mBound) {
// 调用LocalService的一个方法
// 然而，如果这个调用中有挂起操作，那么这个请求应发
// 生在另一个线程来避免拉低activity的性能．
int num = mService.getRandomNumber();
Toast.makeText(this, "number: " + num, Toast.LENGTH_SHORT).show();
}
}
/** 定义service绑定的回调，传给bindService() 的*/
private ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName className,
IBinder service) {
//我们已经绑定到了LocalService，把IBinder进行强制类型转换并且获取LocalService实例．
LocalBinder binder = (LocalBinder) service;
mService = binder.getService();
mBound = true;
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
mBound = false;
}
};
}

public class MyIntentService extends IntentService {
public MyIntentService() {
super("MyIntentService");
}
@Override
protected void onHandleIntent(Intent intent) {
// IntentService会使用单独的线程来执行该方法的代码
// 该方法内执行耗时任务，比如下载文件，此处只是让线程等待20秒
long endTime = System.currentTimeMillis() + 20 * 1000;
System.out.println("onStart");
while (System.currentTimeMillis() < endTime) {
synchronized (this) {
try {
wait(endTime - System.currentTimeMillis());
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
System.out.println("----耗时任务执行完成---");
}
}

public void startIntentService(View source) {
// 创建需要启动的IntentService的Intent
Intent intent = new Intent(this, MyIntentService.class);
startService(intent);