android - sdcard的android意图准备好了

Question

我有一个使用 SD 卡上的文件的应用程序，该应用程序在手机启动时运行，并且很明显，当程序第一次运行时无法访问该文件，因为它在 SD 卡可用之前开始工作。

是否有广播接收器可以用来判断 SD 卡何时准备就绪？

更新

只是总结一下注册意图的答案：

IntentFilter filter = new IntentFilter (Intent.ACTION_MEDIA_MOUNTED); 
filter.addDataScheme("file"); 
registerReceiver(this.mSDInfoReceiver, new IntentFilter(filter));

并创建一个广播接收器来对其做出反应：

private BroadcastReceiver mSDInfoReceiver = new BroadcastReceiver(){
    @Override
    public void onReceive(Context arg0, Intent intent) {
    // Code to react to SD mounted goes here
    }
 }; 

Answer 1

在Intent上查找ACTION_MEDIA_MOUNTED广播操作

public static final String ACTION_MEDIA_MOUNTED

Since: API Level 1
Broadcast Action: External media is present and mounted at its mount point. The path to the mount point for the removed media is contained in the Intent.mData field. The Intent contains an extra with name "read-only" and Boolean value to indicate if the media was mounted read only.
Constant Value: "android.intent.action.MEDIA_MOUNTED"