[Android] to start broadcasting

1. Define broadcast component, component type BroadcastReceiver class inheritance:

package org.lxh.demo;
 
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
 
public class MyBroadcastReceiverUtil extends BroadcastReceiver {
	
	public MyBroadcastReceiverUtil(){
	       System.out.println("***每次广播都会实例化一个新的广播组件进行操作！");
	}
 
	@Override
	public void onReceive(Context context, Intent intent) {//注意参数
		Toast.makeText(context, "广播已经启动", Toast.LENGTH_LONG).show();
 
	}
 
}

2.main.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
 
    <Button
        android:id="@+id/mybtn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="开始广播" />
 
</LinearLayout>

3. Define Activity program sends a broadcast:

package org.lxh.demo;
 
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
 
public class Hello extends Activity {
	private Button mybtn = null;
 
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState); // 生命周期方法
		super.setContentView(R.layout.main); // 设置要使用的布局管理器
		this.mybtn = (Button) super.findViewById(R.id.mybtn);
		this.mybtn.setOnClickListener(new OnClickListenerImpl());
 
	}
 
	private class OnClickListenerImpl implements OnClickListener {
 
		public void onClick(View arg0) {
			Intent it = new Intent(Intent.ACTION_EDIT);
			Hello.this.sendBroadcast(it);
		}
 
	}
}

4. The broadcast component registered in the AndroidManifest.xml file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.lxh.demo"
    android:versionCode="1"
    android:versionName="1.0" >
 
 
    <uses-sdk android:minSdkVersion="10" />
 
 
    <application
        android:icon="@drawable/icon"
        android:label="@string/app_name" >
        <activity
            android:name=".Hello"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
 
 
        <strong><span style="color:#ff0000;"><receiver
            android:name="MyBroadcastReceiverUtil"
            android:enabled="true" >
            <intent-filter>
                <action android:name="android.intent.action.EDIT" />
            </intent-filter>
        </receiver></span></strong>
    </application>
 
</manifest>

5. Run the examples are as follows: