SD卡状态广播

SD状态发生改变的时候会对外发送广播。SD卡的状态一般有挂载、未挂载和无SD卡。

清单文件

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一个广播接受者可以接受多条广播。这里在意图过滤器中添加是data属性是因为广播也需要进行匹配的。对方发送的广播中有Data属性，这里就应添加Data属性。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="xidian.dy.com.chujia">
    <uses-permission android:name="android.permission.RECEIVE_SMS"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:label="主界面">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name=".SDstatusReceiver">
            <intent-filter>
                <action android:name="android.intent.action.MEDIA_MOUNTED"/>
                <action android:name="android.intent.action.MEDIA_REMOVED"/>
                <action android:name="android.intent.action.MEDIA_UNMOUNTED"/>
                <data android:scheme="file"/>
            </intent-filter>
        </receiver>
    </application>
</manifest>

接受者

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接收者通过getAction来区分是那个广播

package xidian.dy.com.chujia;

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

/**
 * Created by dy on 2016/7/12.
 */
public class SDstatusReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        //判断收到的广播类型
        String action = intent.getAction();
        if("android.intent.action.MEDIA_MOUNTED".equals(action)){
            Toast.makeText(context,"SD已挂载", Toast.LENGTH_LONG).show();
        }
        else if("android.intent.action.MEDIA_REMOVED".equals(action)){
            Toast.makeText(context, "无SD", Toast.LENGTH_SHORT).show();
        }
        else if("android.intent.action.MEDIA_UNMOUNTED".equals(action)){
            Toast.makeText(context, "SD未挂载", Toast.LENGTH_SHORT).show();
        }
    }
}