Android 7.0开机广播的及时性

Question

hi all
目前有个需求是重启机器后，要能马上从关机前的状态恢复。所以监听了 “android.intent.action.BOOT_COMPLETED”
此开机广播，但是此广播一般得在系统展示桌面后7秒钟左右才收到，所以会处理不及时。
后来我又注册了"android.media.AUDIO_BECOMING_NOISY"，此广播比开机广播更早发出来，在还没看到锁屏或者桌面时，app已经收到此广播了。所以在Android6.0上能满足这需求，但是在Android7.0上，此media广播就没有发出。这是为什么呢？需要修改framework吗？

或者有没有其他重启后能及时发出的广播呢？

谢谢你。

Answer 1

 1，监听系统开机广播Android.intent.action.BOOT_COMPLETED
2，访问系统开机事件的权限android.permission.RECEIVE_BOOT_COMPLETED"
程序效果：开机的时候，显示出当前的时间段，上午，中午，下午，晚上，在Toast中显示。
manifest
[html] view plain copy
<?xml version="1.0" encoding="utf-8"?>  
<manifest xmlns:android="http://schemas.android.com/apk/res/android"  
    package="com.song"  
    android:versionCode="1"  
    android:versionName="1.0" >  

    <uses-sdk android:minSdkVersion="8" />  

    <application  
        android:icon="@drawable/ic_launcher"  
        android:label="@string/app_name" >  
        <activity  
            android:label="@string/app_name"  
            android:name=".C49_BroadcastToastActivity" >  
            <intent-filter >  
                <action android:name="android.intent.action.MAIN" />  

                <category android:name="android.intent.category.LAUNCHER" />  
            </intent-filter>  
        </activity>  
        <receiver android:name=".MyBroadcast">  
            <intent-filter >  
                <action android:name="android.intent.action.BOOT_COMPLETED"/>  
            </intent-filter>  
        </receiver>  
    </application>  
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>  

</manifest>  
主activity
[java] view plain copy
package com.song;  
/* 
 * 开机的广播,Android.intent.action.BOOT_COMPLETE 
 * 开机的时候，显示出当前的时间段，上午，中午，下午，晚上 
 * Toast中显示 
 */  
import android.app.Activity;  
import android.os.Bundle;  

public class C49_BroadcastToastActivity extends Activity {  
    /** Called when the activity is first created. */  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
    }  
}  

receiver
[java] view plain copy
package com.song;  

import java.util.Calendar;  

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

public class MyBroadcast extends BroadcastReceiver{  
    Calendar c;  
    @Override  
    public void onReceive(Context context, Intent intent) {  
        // TODO Auto-generated method stub  
        c=Calendar.getInstance();  
        int hour=c.get(Calendar.HOUR_OF_DAY);  
        if(hour>=0&&hour<=10)  
        {  
            Toast.makeText(context, "上午", Toast.LENGTH_LONG).show();  
        }  
        if(hour>10&&hour<13)  
        {  
            Toast.makeText(context, "中午", Toast.LENGTH_LONG).show();  
        }  
        if(hour>=13&&hour<=18)  
        {  
            Toast.makeText(context, "下午", Toast.LENGTH_LONG).show();  
        }  
        if(hour>18&&hour<24)  
        {  
            Toast.makeText(context, "晚上", Toast.LENGTH_LONG).show();  
        }  
        System.out.println("hour"+c.get(Calendar.HOUR_OF_DAY));  
    }  

}  

1，监听系统开机广播Android.intent.action.BOOT_COMPLETED
2，访问系统开机事件的权限android.permission.RECEIVE_BOOT_COMPLETED"
程序效果：开机的时候，显示出当前的时间段，上午，中午，下午，晚上，在Toast中显示。
manifest
[html] view plain copy
<?xml version="1.0" encoding="utf-8"?>

package="com.song"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="8" />  

<application  
    android:icon="@drawable/ic_launcher"  
    android:label="@string/app_name" >  
    <activity  
        android:label="@string/app_name"  
        android:name=".C49_BroadcastToastActivity" >  
        <intent-filter >  
            <action android:name="android.intent.action.MAIN" />  

            <category android:name="android.intent.category.LAUNCHER" />  
        </intent-filter>  
    </activity>  
    <receiver android:name=".MyBroadcast">  
        <intent-filter >  
            <action android:name="android.intent.action.BOOT_COMPLETED"/>  
        </intent-filter>  
    </receiver>  
</application>  
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>  

主activity
[java] view plain copy
package com.song;

/*

• 开机的广播,Android.intent.action.BOOT_COMPLETE
• 开机的时候，显示出当前的时间段，上午，中午，下午，晚上
• Toast中显示 */
  import android.app.Activity;
  import android.os.Bundle;
  

public class C49_BroadcastToastActivity extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

}

}

receiver
[java] view plain copy
package com.song;

import java.util.Calendar;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.widget.Toast;

public class MyBroadcast extends BroadcastReceiver{

Calendar c;

@Override

public void onReceive(Context context, Intent intent) {

// TODO Auto-generated method stub

c=Calendar.getInstance();

int hour=c.get(Calendar.HOUR_OF_DAY);

if(hour>=0&&hour<=10)

{

Toast.makeText(context, "上午", Toast.LENGTH_LONG).show();

}

if(hour>10&&hour {
Toast.makeText(context, "中午", Toast.LENGTH_LONG).show();
}
if(hour>=13&&hour<=18)

{

Toast.makeText(context, "下午", Toast.LENGTH_LONG).show();

}

if(hour>18&&hour<24)

{

Toast.makeText(context, "晚上", Toast.LENGTH_LONG).show();

}

System.out.println("hour"+c.get(Calendar.HOUR_OF_DAY));

}

}