从零开始学android(BroadCast广播.四十五.)

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。

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");
}
	@Override
	public void onReceive(Context context, Intent intent) {
		// TODO Auto-generated method stub
Toast.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;

	@Override
	protected 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() {

			@Override
			public 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

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<喎?http://www.Bkjia.com/kf/ware/vc/" target="_blank" class="keylink">vcD4KPHA+PC9wPgo8cHJlIGNsYXNzPQ=="brush:java;">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; @Override protected 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() { @Override public 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 {

	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void onCreate() {
		// TODO Auto-generated method stub
		System.out.println("** SERVICE onCreate");
		super.onCreate();
	}

	@Override
	public void onDestroy() {
		// TODO Auto-generated method stub
		System.out.println("** SERVICE onDestroy");
		super.onDestroy();
	}

	@Override
	public int onStartCommand(Intent intent, int flags, int startId) {
		// TODO Auto-generated method stub
		System.out.println("** SERVICE onStartCommand");
		return Service.START_CONTINUATION_MASK;
	}

}

BroadCask

package com.example.broadecast2;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class MyBroadeCast extends BroadcastReceiver {

	@Override
	public 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

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 {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.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() {

					@Override
					public void onClick(DialogInterface dialog, int which) {
						// TODO Auto-generated method stub
						AlertMessage.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 {

	@Override
	public void onReceive(Context context, Intent intent) {
		// TODO Auto-generated method stub
		Intent 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() {
		
		@Override
		public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
			// TODO Auto-generated method stub
			MainActivity.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() {
		
		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
		Intent 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() {
		
		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			if (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