系出名门Android(4) - 活动(Activity), 服务(Service), 广...

系出名门Android(4) - 活动(Activity), 服务(Service), 广播(Broadcast), 广播接收器(BroadcastReceiv

文章分类:移动开发

转自:http://www.cnblogs.com/webabcd/archive/2010/01/21/1652982.html

介绍
在 Android 中使用 Activity, Service, Broadcast, BroadcastReceiver
活动(Activity) - 用于表现功能
服务(Service) - 相当于后台运行的 Activity
广播(Broadcast) - 用于发送广播
广播接收器(BroadcastReceiver) - 用于接收广播
Intent - 用于连接以上各个组件，并在其间传递消息

1、演示 Activity 的基本用法，一个 Activity 启动另一个 Activity，启动另一个 Activity 时为其传递参数，被启动的 Activity 返回参数给启动者的 Activity

Java代码

Main.java
代码
package com.webabcd.activity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class Main extends Activity {
TextView txt;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.main);
txt = (TextView) this.findViewById(R.id.txt);
txt.setText("Activity 1");
Button btn = (Button) this.findViewById(R.id.btn);
btn.setText("启动另一个Activity");
btn.setOnClickListener(new Button.OnClickListener() {
@Override
public void onClick(View v) {
// 实例化 Intent，指定需要启动的 Activity
Intent intent = new Intent();
intent.setClass(Main.this, MyActivity.class);
// 实例化 Bundle，设置需要传递的参数
Bundle bundle = new Bundle();
bundle.putString("name", "webabcd");
bundle.putDouble("salary", 100.13);
// 将需要传递的参数赋值给 Intent 对象
intent.putExtras(bundle);
// startActivity(intent); // 启动指定的 Intent（不等待返回结果）
// Main.this.finish();
// 启动指定的 Intent，并等待返回结果
// 其中第二个参数如果大于等于零，则返回结果时会回调 onActivityResult() 方法
startActivityForResult(intent, 0);
}
});
Log.d("MyDebug", "onCreate");
}
// 被启动的 Activity 返回结果时的回调函数
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == Activity.RESULT_OK){
Bundle bundle = data.getExtras();
String name = bundle.getString("name");
double salary = bundle.getDouble("salary");
txt.setText("Activity 1" + "\n名字：" + name + "\n薪水：" + String.valueOf(salary));
}
}
@Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
Log.d("MyDebug", "onStart");
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
Log.d("MyDebug", "onStop");
}
@Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
Log.d("MyDebug", "onRestart");
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
Log.d("MyDebug", "onPause");
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
Log.d("MyDebug", "onResume");
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
Log.d("MyDebug", "onDestroy");
}
}
MyActivity.java
代码
package com.webabcd.activity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
// 被另一个 Activity 所启动的 Activity
public class MyActivity extends Activity {
Intent intent;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.main2);
// 获取启动者传递过来的参数
intent = this.getIntent();
Bundle bundle = intent.getExtras();
String name = bundle.getString("name");
double salary = bundle.getDouble("salary");
TextView txt = (TextView) this.findViewById(R.id.txt);
txt.setText("Activity 2" + "\n名字：" + name + "\n薪水：" + String.valueOf(salary));
Button btn = (Button) this.findViewById(R.id.btn);
btn.setText("返回前一个Activity");
btn.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
// 返回参数给启动者
MyActivity.this.setResult(Activity.RESULT_OK, intent);
MyActivity.this.finish();
}
});
}
}
AndroidManifest.xml
代码
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.webabcd.activity" android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".Main" android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!--
如果有需要用到的 Activity ，则都要在这里做相应的配置
-->
<activity android:name=".MyActivity" android:label="Activity 2" />
</application>
<uses-sdk android:minSdkVersion="3" />
</manifest>
2、Service, Broadcast, BroadcastReceiver 的演示
Main.java
代码
package com.webabcd.service;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
/*
* startService() 和 bindService() 的区别
* startService() - 正常理解就好
* bindService() - 使当前上下文对象（本例中就是 Activity）通过一个 ServiceConnection 对象邦定到指定的 Service 。这样，如果上下文对象销毁了的话，那么其对应的 Service 也会被销毁
*/
public class Main extends Activity implements OnClickListener {
private TextView txtMsg;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setTitle("android 之 service");
this.findViewById(R.id.btnStart).setOnClickListener(this);
this.findViewById(R.id.btnStop).setOnClickListener(this);
this.findViewById(R.id.btnBind).setOnClickListener(this);
this.findViewById(R.id.btnUnbind).setOnClickListener(this);
txtMsg = (TextView)this.findViewById(R.id.txtMsg);
// 实例化自定义的 BroadcastReceiver
receiver = new UpdateReceiver();
IntentFilter filter = new IntentFilter();
// 为 BroadcastReceiver 指定 action ，使之用于接收同 action 的广播
filter.addAction("com.webabcd.service.msg");
// 以编程方式注册 BroadcastReceiver 。配置方式注册 BroadcastReceiver 的例子见 AndroidManifest.xml 文件
// 一般在 OnStart 时注册，在 OnStop 时取消注册
this.registerReceiver(receiver, filter);
// this.unregisterReceiver(receiver);
}
@Override
public void onClick(View v) {
Intent intent = new Intent(Main.this, MyService.class);
switch (v.getId()) {
case R.id.btnStart:
this.startService(intent);
break;
case R.id.btnStop:
this.stopService(intent);
break;
case R.id.btnBind:
this.bindService(intent, conn, Context.BIND_AUTO_CREATE);
break;
case R.id.btnUnbind:
this.unbindService(conn);
break;
}
}
// bindService() 所需的 ServiceConnection 对象
private ServiceConnection conn = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName className, IBinder service) {
}
@Override
public void onServiceDisconnected(ComponentName className) {
}
};
private String msg="";
private UpdateReceiver receiver;
// 实现一个 BroadcastReceiver，用于接收指定的 Broadcast
public class UpdateReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
msg = intent.getStringExtra("msg");
txtMsg.append(msg + "\n");
}
}
}
MyService.java
代码
package com.webabcd.service;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
// 演示 Service 的生命周期。具体信息运行程序后在 LogCat 中查看
public class MyService extends Service {
@Override
public IBinder onBind(Intent intent) {
Log.d("MyDebug", "onBind");
sendMsg("onBind");
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
Log.d("MyDebug", "onCreate");
sendMsg("onCreate");
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
Log.d("MyDebug", "onDestroy");
sendMsg("onDestroy");
}
@Override
public void onRebind(Intent intent) {
// TODO Auto-generated method stub
super.onRebind(intent);
Log.d("MyDebug", "onRebind");
sendMsg("onRebind");
}
@Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
Log.d("MyDebug", "onStart");
sendMsg("onStart");
}
@Override
public boolean onUnbind(Intent intent) {
Log.d("MyDebug", "onUnbind");
sendMsg("onUnbind");
// TODO Auto-generated method stub
return super.onUnbind(intent);
}
// 发送广播信息
private void sendMsg(String msg){
// 指定广播目标的 action （注：指定了此 action 的 receiver 会接收此广播）
Intent intent = new Intent("com.webabcd.service.msg");
// 需要传递的参数
intent.putExtra("msg", msg);
// 发送广播
this.sendBroadcast(intent);
}
}
MyBootReceiver.java
代码
package com.webabcd.service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class MyBootReceiver extends BroadcastReceiver {
// 用于接收满足条件的 Broadcast（相应的 Broadcast 的注册信息详见 AndroidManifest.xml ，当系统启动完毕后会调用这个广播接收器）
@Override
public void onReceive(Context arg0, Intent arg1) {
Log.d("MyDebug", "onReceive");
// 启动服务
Intent service = new Intent(arg0, MyService.class);
arg0.startService(service);
}
}
AndroidManifest.xml
代码
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.webabcd.service" android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".Main" android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!--
如果有需要用到的 service ，则都要在这里做相应的配置
-->
<service android:name=".MyService"></service>
<!--
注册一个 BroadcastReceiver
其 intent-filter 为 android.intent.action.BOOT_COMPLETED（用于接收系统启动完毕的 Broadcast）
-->
<receiver android:name=".MyBootReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
</application>
<!--
接受系统启动完毕的 Broadcast 的权限
-->
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-sdk android:minSdkVersion="3" />
</manifest>
OK

Main.java代码package com.webabcd.activity;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.TextView;public class Main extends Activity {TextView txt;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);this.setContentView(R.layout.main);txt = (TextView) this.findViewById(R.id.txt);txt.setText("Activity 1");Button btn = (Button) this.findViewById(R.id.btn);btn.setText("启动另一个Activity");btn.setOnClickListener(new Button.OnClickListener() {@Overridepublic void onClick(View v) {// 实例化 Intent，指定需要启动的 ActivityIntent intent = new Intent();intent.setClass(Main.this, MyActivity.class);// 实例化 Bundle，设置需要传递的参数Bundle bundle = new Bundle();bundle.putString("name", "webabcd");bundle.putDouble("salary", 100.13);// 将需要传递的参数赋值给 Intent 对象intent.putExtras(bundle);// startActivity(intent); // 启动指定的 Intent（不等待返回结果）// Main.this.finish();// 启动指定的 Intent，并等待返回结果// 其中第二个参数如果大于等于零，则返回结果时会回调 onActivityResult() 方法startActivityForResult(intent, 0);}});Log.d("MyDebug", "onCreate");}// 被启动的 Activity 返回结果时的回调函数@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {if (resultCode == Activity.RESULT_OK){Bundle bundle = data.getExtras();String name = bundle.getString("name");double salary = bundle.getDouble("salary");txt.setText("Activity 1" + "\n名字：" + name + "\n薪水：" + String.valueOf(salary));}}@Overrideprotected void onStart() {// TODO Auto-generated method stubsuper.onStart();Log.d("MyDebug", "onStart");}@Overrideprotected void onStop() {// TODO Auto-generated method stubsuper.onStop();Log.d("MyDebug", "onStop");}@Overrideprotected void onRestart() {// TODO Auto-generated method stubsuper.onRestart();Log.d("MyDebug", "onRestart");}@Overrideprotected void onPause() {// TODO Auto-generated method stubsuper.onPause();Log.d("MyDebug", "onPause");}@Overrideprotected void onResume() {// TODO Auto-generated method stubsuper.onResume();Log.d("MyDebug", "onResume");}@Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();Log.d("MyDebug", "onDestroy");}}MyActivity.java代码package com.webabcd.activity;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.TextView;// 被另一个 Activity 所启动的 Activitypublic class MyActivity extends Activity {Intent intent;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);this.setContentView(R.layout.main2);// 获取启动者传递过来的参数intent = this.getIntent();Bundle bundle = intent.getExtras();String name = bundle.getString("name");double salary = bundle.getDouble("salary");TextView txt = (TextView) this.findViewById(R.id.txt);txt.setText("Activity 2" + "\n名字：" + name + "\n薪水：" + String.valueOf(salary));Button btn = (Button) this.findViewById(R.id.btn);btn.setText("返回前一个Activity");btn.setOnClickListener(new Button.OnClickListener() {public void onClick(View v) {// 返回参数给启动者MyActivity.this.setResult(Activity.RESULT_OK, intent);MyActivity.this.finish();}});}}AndroidManifest.xml代码<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.webabcd.activity" android:versionCode="1"android:versionName="1.0"><application android:icon="@drawable/icon" android:label="@string/app_name"><activity android:name=".Main" android:label="@string/app_name"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity><!--如果有需要用到的 Activity ，则都要在这里做相应的配置--><activity android:name=".MyActivity" android:label="Activity 2" /></application><uses-sdk android:minSdkVersion="3" /></manifest>2、Service, Broadcast, BroadcastReceiver 的演示Main.java代码package com.webabcd.service;import android.app.Activity;import android.content.BroadcastReceiver;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.content.ServiceConnection;import android.os.Bundle;import android.os.IBinder;import android.view.View;import android.view.View.OnClickListener;import android.widget.TextView;/** startService() 和 bindService() 的区别* startService() - 正常理解就好* bindService() - 使当前上下文对象（本例中就是 Activity）通过一个 ServiceConnection 对象邦定到指定的 Service 。这样，如果上下文对象销毁了的话，那么其对应的 Service 也会被销毁*/public class Main extends Activity implements OnClickListener {private TextView txtMsg;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);setTitle("android 之 service");this.findViewById(R.id.btnStart).setOnClickListener(this);this.findViewById(R.id.btnStop).setOnClickListener(this);this.findViewById(R.id.btnBind).setOnClickListener(this);this.findViewById(R.id.btnUnbind).setOnClickListener(this);txtMsg = (TextView)this.findViewById(R.id.txtMsg);// 实例化自定义的 BroadcastReceiverreceiver = new UpdateReceiver();IntentFilter filter = new IntentFilter();// 为 BroadcastReceiver 指定 action ，使之用于接收同 action 的广播filter.addAction("com.webabcd.service.msg");// 以编程方式注册  BroadcastReceiver 。配置方式注册 BroadcastReceiver 的例子见 AndroidManifest.xml 文件// 一般在 OnStart 时注册，在 OnStop 时取消注册this.registerReceiver(receiver, filter);// this.unregisterReceiver(receiver);}@Overridepublic void onClick(View v) {Intent intent = new Intent(Main.this, MyService.class);switch (v.getId()) {case R.id.btnStart:this.startService(intent);break;case R.id.btnStop:this.stopService(intent);break;case R.id.btnBind:this.bindService(intent, conn, Context.BIND_AUTO_CREATE);break;case R.id.btnUnbind:this.unbindService(conn);break;}}// bindService() 所需的 ServiceConnection 对象private ServiceConnection conn = new ServiceConnection() {@Overridepublic void onServiceConnected(ComponentName className, IBinder service) {}@Overridepublic void onServiceDisconnected(ComponentName className) {}};private String msg="";private UpdateReceiver receiver;// 实现一个 BroadcastReceiver，用于接收指定的 Broadcastpublic class UpdateReceiver extends BroadcastReceiver{@Overridepublic void onReceive(Context context, Intent intent) {msg = intent.getStringExtra("msg");txtMsg.append(msg + "\n");}}}MyService.java代码package com.webabcd.service;import android.app.Service;import android.content.Intent;import android.os.IBinder;import android.util.Log;// 演示 Service 的生命周期。具体信息运行程序后在 LogCat 中查看public class MyService extends Service {@Overridepublic IBinder onBind(Intent intent) {Log.d("MyDebug", "onBind");sendMsg("onBind");// TODO Auto-generated method stubreturn null;}@Overridepublic void onCreate() {// TODO Auto-generated method stubsuper.onCreate();Log.d("MyDebug", "onCreate");sendMsg("onCreate");}@Overridepublic void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();Log.d("MyDebug", "onDestroy");sendMsg("onDestroy");}@Overridepublic void onRebind(Intent intent) {// TODO Auto-generated method stubsuper.onRebind(intent);Log.d("MyDebug", "onRebind");sendMsg("onRebind");}@Overridepublic void onStart(Intent intent, int startId) {super.onStart(intent, startId);Log.d("MyDebug", "onStart");sendMsg("onStart");}@Overridepublic boolean onUnbind(Intent intent) {Log.d("MyDebug", "onUnbind");sendMsg("onUnbind");// TODO Auto-generated method stubreturn super.onUnbind(intent);}// 发送广播信息private void sendMsg(String msg){// 指定广播目标的 action （注：指定了此 action 的 receiver 会接收此广播）Intent intent = new Intent("com.webabcd.service.msg");// 需要传递的参数intent.putExtra("msg", msg);// 发送广播this.sendBroadcast(intent);}}MyBootReceiver.java代码package com.webabcd.service;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.util.Log;public class MyBootReceiver extends BroadcastReceiver {// 用于接收满足条件的 Broadcast（相应的 Broadcast 的注册信息详见 AndroidManifest.xml ，当系统启动完毕后会调用这个广播接收器）@Overridepublic void onReceive(Context arg0, Intent arg1) {Log.d("MyDebug", "onReceive");// 启动服务Intent service = new Intent(arg0, MyService.class);arg0.startService(service);}}AndroidManifest.xml代码<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.webabcd.service" android:versionCode="1"android:versionName="1.0"><application android:icon="@drawable/icon" android:label="@string/app_name"><activity android:name=".Main" android:label="@string/app_name"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity><!--如果有需要用到的 service ，则都要在这里做相应的配置--><service android:name=".MyService"></service><!--注册一个 BroadcastReceiver其 intent-filter 为 android.intent.action.BOOT_COMPLETED（用于接收系统启动完毕的 Broadcast）--><receiver android:name=".MyBootReceiver"><intent-filter><action android:name="android.intent.action.BOOT_COMPLETED" /></intent-filter></receiver></application><!--接受系统启动完毕的 Broadcast 的权限--><uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" /><uses-sdk android:minSdkVersion="3" /></manifest>OK

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