通过bind实现activity与service的交互

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.zzw.bind.MainActivity" >

<Button
android:id="@+id/start"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="71dp"
android:text="start" />

<Button
android:id="@+id/bind"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/start"
android:layout_below="@+id/start"
android:layout_marginTop="65dp"
android:text="bind" />

<Button
android:id="@+id/dedao"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/bind"
android:layout_alignParentBottom="true"
android:layout_marginBottom="80dp"
android:text="取值" />

</RelativeLayout>

布局

package com.zzw.bind;

import com.zzw.bind.MyAppService.MyBinder;

import android.app.Activity;
import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;

public class MainActivity extends Activity {
private ServiceConnection sc;
private MyAppService myAppService;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

sc = new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) {

}

@Override
public void onServiceConnected(ComponentName name, IBinder service) {
MyBinder mBinder = (MyBinder) service;
myAppService = mBinder.getService();
}
};
findViewById(R.id.start).setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
startService();
}
});
findViewById(R.id.bind).setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
bindService();
}
});
findViewById(R.id.dedao).setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
String str = myAppService.getServiceValue();
Log.d("得到的值", str);
}
});

}

private void startService() {
myAppService.setServiceValue("hello");

Intent intent = new Intent(this, MyAppService.class);
startService(intent);
}

private void bindService() {
Intent intent = new Intent(this, MyAppService.class);
bindService(intent, sc, Service.BIND_AUTO_CREATE);
}

@Override
protected void onDestroy() {
super.onDestroy();
Intent intent = new Intent(this, MyAppService.class);
stopService(intent);
Log.d("MainActivity", "onDestroy");
}

}

package com.zzw.bind;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;

public class MyAppService extends Service {
private String str;

@Override
public void onCreate() {
super.onCreate();
Log.d("MyAppService","onCreate");
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
this.str=str+",world";
Log.d("onStartCommand",str);
return super.onStartCommand(intent, flags, startId);
}

public String getServiceValue() {
Log.d("getServiceValue", str);
return str;
}

public void setServiceValue(String str) {
Log.d("setServiceValue", str);
this.str = str;
}

@Override
public IBinder onBind(Intent intent) {
Log.d("onBind", "======");
return new MyBinder();
}

public class MyBinder extends Binder {
public MyAppService getService() {
Log.d("getService", "====");
return MyAppService.this;
}
}

@Override
public void onDestroy() {
Log.d("MyAppService", "onDestroy");
super.onDestroy();
}

@Override
public boolean onUnbind(Intent intent) {
Log.d("MyAppService", "onUnbind");
return super.onUnbind(intent);
}

}