从零开始学android<BroadCast广播.四十五.>

与Service相似，在android中还有一种运行在后台的4大组件之一，他就是broadCcast，但是他不用考虑是否有接受的对象，只需要考虑发送即可。

要想使用BroadCast我们可以使用两种方法

第一：将broadCcast配置到配置文件当中。

第二：将broadCcast与class文件进行绑定。

下面我们分别来进行说明。

<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"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:layout_marginTop="134dp"        android:text="开启通知" /></RelativeLayout>

广播类

package com.example.broadcast;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.widget.Toast;public class BroadCastUtil extends BroadcastReceiver {public void BroadcastReceiver(){System.out.println("**一个广播事件被建立");}@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubToast.makeText(context, "广播已经启动", 2).show();}}

主文件

package com.example.broadcast;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;public class MainActivity extends Activity {private Button button;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);super.setContentView(R.layout.activity_main);button = (Button) this.findViewById(R.id.button1);button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stub// 设置过滤Intent intent = new Intent(Intent.ACTION_EDIT);// 开启广播MainActivity.this.sendBroadcast(intent);}});}}

在 application节点下增加 配置

<receiver android:name="BroadCastUtil" android:enabled="true" >            <intent-filter ><action android:name="android.intent.action.EDIT"/></intent-filter>         </receiver>

            

使用registerReceiver(BroadcastReceiver, IntentFilter)进行绑定过滤操作

其他的不用进行改变只用改变

主文件 就OK

package com.example.broadcast;import android.app.Activity;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.view.View;import android.widget.Button;public class MainActivity extends Activity {private Button button;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);super.setContentView(R.layout.activity_main);button = (Button) this.findViewById(R.id.button1);button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stub// 设置过滤Intent intent = new Intent("com.example.broadcast");IntentFilter filter=new IntentFilter("com.example.broadcast");BroadCastUtil broadCastUtil=new BroadCastUtil();MainActivity.this.registerReceiver(broadCastUtil, filter);// 开启广播MainActivity.this.sendBroadcast(intent);}});}}

这样进行绑定和配置的话，配置文件中就不需要配置信息了 。

使用广播启动Service

Service

package com.example.broadecast2;import android.app.Service;import android.content.Intent;import android.os.IBinder;public class MyService extends Service {@Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubreturn null;}@Overridepublic void onCreate() {// TODO Auto-generated method stubSystem.out.println("** SERVICE onCreate");super.onCreate();}@Overridepublic void onDestroy() {// TODO Auto-generated method stubSystem.out.println("** SERVICE onDestroy");super.onDestroy();}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {// TODO Auto-generated method stubSystem.out.println("** SERVICE onStartCommand");return Service.START_CONTINUATION_MASK;}}<strong></strong>

BroadCask

package com.example.broadecast2;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;public class MyBroadeCast extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent1) {context.startService(new Intent(context,MyService.class)) ;}}

Main

package com.example.broadecast2;import android.os.Bundle;import android.app.Activity;import android.app.PendingIntent;import android.content.Intent;import android.view.Menu;//使用 广播启动服务public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Intent intent =new Intent("com.example.broadecast2.DEMO");        MainActivity.this.sendBroadcast(intent);    }    }

使用广播进行闹钟的控制

<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"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <TimePicker        android:id="@+id/timePicker1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true" />    <Button        android:id="@+id/button2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/button1"        android:layout_alignBottom="@+id/button1"        android:layout_alignParentRight="true"        android:text="取消闹钟" />    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/timePicker1"        android:layout_alignParentBottom="true"        android:layout_marginBottom="30dp"        android:text="设置闹钟" />    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_above="@+id/button1"        android:layout_alignParentLeft="true"        android:layout_alignParentRight="true"        android:layout_marginBottom="62dp"        android:text="当前未设置闹钟"        android:textAppearance="?android:attr/textAppearanceLarge" /></RelativeLayout><strong></strong>

对话框

package com.example.broadcast3;import java.text.SimpleDateFormat;import java.util.Date;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.os.Bundle;public class AlertMessage extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);new AlertDialog.Builder(this).setIcon(R.drawable.b9).setTitle("闹钟时间到").setMessage("当前时间为："+ new SimpleDateFormat("yyyy年MM月dd日 HH时 mm分 ss秒").format(new Date())).setNegativeButton("取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubAlertMessage.this.finish();}}).create().show();}}

广播类

package com.example.broadcast3;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;public class MyBroadCast extends BroadcastReceiver {@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stubIntent it = new Intent(context, AlertMessage.class);it.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);context.startActivity(it);}}

Main

package com.example.broadcast3;import java.util.Calendar;import android.os.Bundle;import android.R.integer;import android.app.Activity;import android.app.AlarmManager;import android.app.PendingIntent;import android.content.Context;import android.content.Intent;import android.view.Menu;import android.view.View;import android.widget.Button;import android.widget.TextView;import android.widget.TimePicker;import android.widget.TimePicker.OnTimeChangedListener;import android.widget.Toast;public class MainActivity extends Activity {private Button set,delete;private TextView info;private TimePicker time;private int hour ;private int minute;private Calendar calendar = Calendar.getInstance() ;private AlarmManager alarm;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    set=(Button)this.findViewById(R.id.button1);    delete=(Button)this.findViewById(R.id.button2);    info=(TextView)this.findViewById(R.id.textView1);    time=(TimePicker)this.findViewById(R.id.timePicker1);    time.setIs24HourView(true);this.alarm = (AlarmManager) super.getSystemService(Context.ALARM_SERVICE) ;    time.setOnTimeChangedListener(new OnTimeChangedListener() {@Overridepublic void onTimeChanged(TimePicker view, int hourOfDay, int minute) {// TODO Auto-generated method stubMainActivity.this.hour=hourOfDay;MainActivity.this.minute=minute;MainActivity.this.calendar.setTimeInMillis(System.currentTimeMillis()) ;MainActivity.this.calendar.set(Calendar.HOUR_OF_DAY, hourOfDay) ;MainActivity.this.calendar.set(Calendar.MINUTE, minute) ;MainActivity.this.calendar.set(Calendar.SECOND, 0) ;MainActivity.this.calendar.set(Calendar.MILLISECOND, 0) ;}});    set.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubIntent intent =new Intent(MainActivity.this, AlertMessage.class);intent.setAction("com.example.broadcast3");PendingIntent sender=PendingIntent.getActivity(MainActivity.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);MainActivity.this.alarm.set(AlarmManager.RTC_WAKEUP,MainActivity.this.calendar.getTimeInMillis(), sender);MainActivity.this.info.setText("闹钟响起的时间是："+ MainActivity.this.hour + "时"+ MainActivity.this.minute + "分。");Toast.makeText(MainActivity.this, "闹钟设置成功！",Toast.LENGTH_LONG).show();}});        delete.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubif (MainActivity.this.alarm != null) {Intent intent = new Intent(MainActivity.this,MyBroadCast.class);intent.setAction("org.lxh.action.setalarm") ;PendingIntent sender = PendingIntent.getBroadcast(MainActivity.this, 0, intent,PendingIntent.FLAG_UPDATE_CURRENT);MainActivity.this.alarm.cancel(sender) ;// 取消MainActivity.this.info.setText("当前没有设置闹钟。") ;Toast.makeText(MainActivity.this, "闹钟删除成功！",Toast.LENGTH_LONG).show();}}});    }    }

下节预报：android基本绘图