安卓开发观察者模式应用-一个service通知多个activity更新ui的实现

service与activity的交互：

1.接口回调

2.自定义广播

3.观察者模式

demo下载地址 源码传送门

今天练习了下使用观察者模式，service与多个activity的交互

service的实现

package com.joey.observabledemo;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.support.annotation.Nullable;

import java.util.Observable;
import java.util.Observer;

/**
* Created by Administrator on 2017/8/31.
*/

public class ContentService extends Service{
private MyObservable myObservable;
@Nullable
@Override
public IBinder onBind(Intent intent) {
return new LocalBinder();
}
public final class LocalBinder extends Binder{
public ContentService getService(){
return ContentService.this;
}
}

public void asyncPostPerson(final String name){
//模拟耗时，终止5秒
new Thread(){
@Override
public void run() {
super.run();
try {
sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
}
handler.sendMessage(handler.obtainMessage(0x01,name));
}
}.start();
}

/**
* 添加观察者
* @param observer
*/
public void addObservable(Observer observer){
myObservable.addObserver(observer);
}

@Override
public void onCreate() {
super.onCreate();
myObservable = new MyObservable();
}
private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what){
case 0x01:
String name = (String) msg.obj;
Person person = new Person();
person.setName(name);
myObservable.notifyChanged(p
cc98
erson);
break;
default:
break;
}
}
};

private class MyObservable extends Observable{
public void notifyChanged(Person person){
this.setChanged();
this.notifyObservers(person);
}
}
}

一个activity

public class MainActivity extends AppCompatActivity implements Observer{
private ContentService mService;
private MyServiceConn conn;
private TextView tv;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.content);
conn = new MyServiceConn();
bindService(new Intent(this,ContentService.class),conn,BIND_AUTO_CREATE);
}

public void btnClick(View view) {
switch (view.getId()){
case R.id.button1:
startActivity(new Intent(MainActivity.this,SecondActivity.class));
break;
default:
break;
}
}

public class MyServiceConn implements ServiceConnection{

@Override
public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
mService = ((ContentService.LocalBinder) iBinder).getService();
//将当前Activity添加为观察者
mService.addObservable(MainActivity.this);
}

@Override
public void onServiceDisconnected(ComponentName componentName) {
mService = null;
}
}

@Override
protected void onDestroy() {
super.onDestroy();
unbindService(conn);
}

@Override
public void update(Observable observable, Object o) {
Person person = (Person) o;
tv.setText(person.toString());
}
}

第二个activity

public class SecondActivity extends AppCompatActivity implements Observer{
private TextView textView;
private MyServiceConnection connection;
private ContentService contentService;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
textView = (TextView) findViewById(R.id.content2);

connection = new MyServiceConnection();
bindService(new Intent(SecondActivity.this,ContentService.class),connection,BIND_AUTO_CREATE);

}

public void btnClick(View view) {
switch (view.getId()){
case R.id.button2:
contentService.asyncPostPerson("大理石");
break;
default:
break;
}
}

public class MyServiceConnection implements ServiceConnection{

@Override
public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
contentService = ((ContentService.LocalBinder) iBinder).getService();
contentService.addObservable(SecondActivity.this);
}

@Override
public void onServiceDisconnected(ComponentName componentName) {
contentService = null;
}
}

@Override
protected void onDestroy() {
super.onDestroy();
unbindService(connection);
}

@Override
public void update(Observable observable, Object o) {
Person person = ((Person) o);
textView.setText(person.toString());
}
}

实体类

public class Person {
private String name;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

@Override
public String toString() {
return "Person{" +
"name='" + name + '\'' +
'}';
}
}

demo下载 源码传送门

xml就不贴了 ，一看就懂