們平時(shí)最經(jīng)常使用的是sendBroadcast,就是把一個(gè)Intent廣播出去。今天我在看wifi的時(shí)候，還發(fā)現(xiàn)了sendStickyBroadcast。官方文檔是這樣寫(xiě)的：?


public abstract void sendStickyBroadcast (Intent intent)?

Since: API Level 1?
Perform a sendBroadcast(Intent) that is "sticky," meaning the Intent you are sending stays around after the broadcast is complete, so that others can quickly retrieve that data through the return value of registerReceiver(BroadcastReceiver, IntentFilter). In all other ways, this behaves the same as sendBroadcast(Intent).?
You must hold the BROADCAST_STICKY? permission in order to use this API. If you do not hold that permission, SecurityException will be thrown.
Parameters?

intent The Intent to broadcast; all receivers matching this Intent will receive the broadcast, and?the Intent will be held to be re-broadcast to future receivers.?

光從字面的意思是很難理解的。只有你寫(xiě)例子才會(huì)明白的。

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package com.android.testbroadcast; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity { Button btnSendi; Button btnSends; Button btnStart; Context mContext; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btnSendi=(Button) findViewById(R.id.sendi); btnSends=(Button) findViewById(R.id.sends); btnStart=(Button) findViewById(R.id.start); mContext=getApplicationContext(); btnSendi.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub Intent intent = new Intent(); intent.setAction("com.android.my.action"); intent.setFlags(1); mContext.sendBroadcast(intent); } }); btnStart.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub Intent intent = new Intent(MainActivity.this,ReceiverActivity.class); startActivity(intent); } }); btnSends.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub Intent intent = new Intent(); intent.setAction("com.android.my.action.sticky"); intent.setFlags(2); mContext.sendStickyBroadcast(intent); } }); } }

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package com.android.testbroadcast;
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import android.app.Activity;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.net.wifi.WifiManager;
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import android.os.Bundle;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.widget.Button;
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public class ReceiverActivity extends Activity {
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???????? private IntentFilter mIntentFilter;
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????????
??? /** Called when the activity is first created. */
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??? @Override
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??? public void onCreate(Bundle savedInstanceState) {
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??????? super.onCreate(savedInstanceState);
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??????? setContentView(R.layout.main);
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??????? mIntentFilter = new IntentFilter();
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??????? mIntentFilter.addAction("com.android.my.action");
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??????? mIntentFilter.addAction("com.android.my.action.sticky");
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????????????????????????
??? }
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??? private BroadcastReceiver mReceiver = new BroadcastReceiver() {
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??????? @Override
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??????? public void onReceive(Context context, Intent intent) {
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??????????? final String action = intent.getAction();
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??????????? System.out.println("action"+action);
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????????????
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??????? }
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??? };
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????
??? @Override
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??? protected void onResume() {
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??????????? // TODO Auto-generated method stub
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??????????? super.onResume();
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??????????? registerReceiver(mReceiver, mIntentFilter);
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??? }
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????
??? @Override
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??? protected void onPause() {
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??????????? // TODO Auto-generated method stub
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??????????? super.onPause();
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??????????? unregisterReceiver(mReceiver);
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??? }
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????
????
}

? ? ?本文轉(zhuǎn)自xyz_lmn51CTO博客，原文鏈接：http://blog.51cto.com/xyzlmn/1230800，如需轉(zhuǎn)載請(qǐng)自行聯(lián)系原作者

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