Android5.0上SD卡抽拔发送的Intent研究

废话不多说，直接上代码吧！

package com.example.testsdcard;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;

public class MainActivity extends Activity {

private IntentFilter intentFilter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

// 监听类private
final BroadcastReceiver sdcardListener = new BroadcastReceiver() {

@Override
public void onReceive(Context arg0, Intent arg1) {
// TODO Auto-generated method stub
String action = arg1.getAction();
if (Intent.ACTION_MEDIA_BAD_REMOVAL.equals(action)) {
android.util.Log.i("jiangguohu","ACTION_MEDIA_BAD_REMOVAL");
} else if (Intent.ACTION_MEDIA_CHECKING.equals(action)) {
android.util.Log.i("jiangguohu","ACTION_MEDIA_CHECKING");
} else if (Intent.ACTION_MEDIA_EJECT.equals(action)) {
android.util.Log.i("jiangguohu","ACTION_MEDIA_EJECT");
} else if (Intent.ACTION_MEDIA_MOUNTED.equals(action)) {
android.util.Log.i("jiangguohu","ACTION_MEDIA_MOUNTED");
} else if (Intent.ACTION_MEDIA_REMOVED.equals(action)) {
android.util.Log.i("jiangguohu","ACTION_MEDIA_REMOVED");
} else if (Intent.ACTION_MEDIA_SCANNER_FINISHED.equals(action)) {
android.util.Log.i("jiangguohu","ACTION_MEDIA_SCANNER_FINISHED");
} else if (Intent.ACTION_MEDIA_SCANNER_SCAN_FILE.equals(action)) {
android.util.Log.i("jiangguohu","ACTION_MEDIA_SCANNER_SCAN_FILE");
} else if (Intent.ACTION_MEDIA_SCANNER_STARTED.equals(action)) {
android.util.Log.i("jiangguohu","ACTION_MEDIA_SCANNER_STARTED");
} else if (Intent.ACTION_MEDIA_SHARED.equals(action)) {
android.util.Log.i("jiangguohu","ACTION_MEDIA_SHARED");
} else if (Intent.ACTION_MEDIA_UNMOUNTABLE.equals(action)) {
android.util.Log.i("jiangguohu","ACTION_MEDIA_UNMOUNTABLE");
} else if (Intent.ACTION_MEDIA_UNMOUNTED.equals(action)) {
android.util.Log.i("jiangguohu","ACTION_MEDIA_UNMOUNTED");
} else if (Intent.ACTION_MEDIA_BUTTON.equals(action)) {
android.util.Log.i("jiangguohu","ACTION_MEDIA_BUTTON");
} else if (Intent.ACTION_MEDIA_NOFS.equals(action)) {
android.util.Log.i("jiangguohu","ACTION_MEDIA_NOFS");
}
}
};

intentFilter = new IntentFilter();
intentFilter.addAction(Intent.ACTION_MEDIA_BAD_REMOVAL);
intentFilter.addAction(Intent.ACTION_MEDIA_CHECKING);
intentFilter.addAction(Intent.ACTION_MEDIA_EJECT);
intentFilter.addAction(Intent.ACTION_MEDIA_MOUNTED);
intentFilter.addAction(Intent.ACTION_MEDIA_REMOVED);
intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);
intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_STARTED);
intentFilter.addAction(Intent.ACTION_MEDIA_SHARED);
intentFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTABLE);
intentFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);
intentFilter.addAction(Intent.ACTION_MEDIA_BUTTON);
intentFilter.addAction(Intent.ACTION_MEDIA_NOFS);

intentFilter.addDataScheme("file");
registerReceiver(sdcardListener, intentFilter);
}

}


首先运行程序，在手机中插入SD卡（手机支持热插拔），查看log：
07-31 13:44:27.619: I/jiangguohu(2842): ACTION_MEDIA_CHECKING
07-31 13:44:28.970: I/jiangguohu(2842): ACTION_MEDIA_MOUNTED
07-31 13:44:29.681: I/jiangguohu(2842): ACTION_MEDIA_SCANNER_STARTED
07-31 13:44:33.034: I/jiangguohu(2842): ACTION_MEDIA_SCANNER_FINISHED可以看到，首先检查，然后挂载，再然后扫描。

再然后抽掉SD卡：

07-31 13:43:56.118: I/jiangguohu(2842): ACTION_MEDIA_UNMOUNTED
07-31 13:43:56.188: I/jiangguohu(2842): ACTION_MEDIA_BAD_REMOVAL
07-31 13:43:56.198: I/jiangguohu(2842): ACTION_MEDIA_EJECT

再之后，选择usb storage模式连接电脑（SD卡已经插入）：
07-31 13:41:07.583: I/jiangguohu(2842): ACTION_MEDIA_EJECT
07-31 13:41:09.185: I/jiangguohu(2842): ACTION_MEDIA_UNMOUNTED
07-31 13:41:09.185: I/jiangguohu(2842): ACTION_MEDIA_UNMOUNTED
07-31 13:41:09.195: I/jiangguohu(2842): ACTION_MEDIA_SHARED

最后，取消usb storage模式：
07-31 13:41:39.835: I/jiangguohu(2842): ACTION_MEDIA_UNMOUNTED
07-31 13:41:39.855: I/jiangguohu(2842): ACTION_MEDIA_CHECKING
07-31 13:41:41.086: I/jiangguohu(2842): ACTION_MEDIA_MOUNTED
07-31 13:41:42.217: I/jiangguohu(2842): ACTION_MEDIA_SCANNER_STARTED
07-31 13:41:45.100: I/jiangguohu(2842): ACTION_MEDIA_SCANNER_FINISHED

综上，当SD卡没有挂载的时候 ACTION_MEDIA_EJECT 和 ACTION_MEDIA_UNMOUNTED 都会调用。当SD卡挂载的时候，调用 ACTION_MEDIA_CHECKING 和 ACTION_MEDIA_MOUNTED 。