Android Question How to detect the SD card or usb unmounted/mounted, and get the path

[touchvip]

My APP needs get SD card or usb unmounted/mounted state, and make some file handling.

 

[Erel]

You can use the code posted here to find the external storages: https://www.b4x.com/android/forum/threads/how-to-ext-sd-card-write-on-android-4-4.42177/#post-255351

 

[touchvip]

Thank for Erel
But the way you provide just take the app directory, and can't detect sdcard.
Under the Java code can be detected,Don't know can directly in B4a Java code at the bottom of the call.
BroadcastReceiver class - this class don't know how to package the class library of B4a

package com.example.usbtest;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Message;
import android.util.Log;

public class UsbStatesReceiver extends BroadcastReceiver  {
    MainActivity execactivity;

    public static final int USB_STATE_MSG = 0x00020;
    public static final int USB_STATE_ON = 0x00021;
    public static final int USB_STATE_OFF = 0x00022;
    public IntentFilter filter = new IntentFilter();
 
    public UsbStatesReceiver(Context context){
        execactivity = (MainActivity)context;
        filter.addAction(Intent.ACTION_MEDIA_CHECKING);
        filter.addAction(Intent.ACTION_MEDIA_MOUNTED);
        filter.addAction(Intent.ACTION_MEDIA_EJECT);
        filter.addAction(Intent.ACTION_MEDIA_REMOVED);
        filter.addDataScheme("file");  
    }

    public Intent registerReceiver() {
        return execactivity.registerReceiver(this, filter);
    }

    public void unregisterReceiver() {
        execactivity.unregisterReceiver(this);
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        if(execactivity.mhandler == null){
            return;
        }
     
        Message msg = new Message();
       msg.what = USB_STATE_MSG;
       
       if( intent.getAction().equals(Intent.ACTION_MEDIA_MOUNTED ) ||
              intent.getAction().equals(Intent.ACTION_MEDIA_CHECKING)){
           msg.arg1 = USB_STATE_ON;
           msg.obj=intent.getData().getPath();
         
         
       }else{
           msg.arg1 = USB_STATE_OFF;
       }
       execactivity.mhandler.sendMessage(msg);

    };
 
}

package com.example.usbtest;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {

    MyHandler mhandler;
    UsbStatesReceiver usbstates;
    TextView Usb;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
     
        mhandler = new MyHandler();
        usbstates = new UsbStatesReceiver(this);
        Usb = (TextView)findViewById(R.id.usbstates);
    }

 
 
    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
        usbstates.registerReceiver();
    }



    @Override
    protected void onStop() {
        // TODO Auto-generated method stub
        super.onStop();
        usbstates.unregisterReceiver();
    }



    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    class MyHandler extends Handler{
        public MyHandler(){};
     
        @Override
        public void handleMessage(Message msg) {

            super.handleMessage(msg);
            System.out.println("=============mainactivity handler");


            if(msg.arg1 == 0x00021)    Usb.setText("Usb is mounted"+msg.obj.toString());
            else if(msg.arg1 == 0x00022)  Usb.setText("Usb is out");
        }
    }
}

 

[Erel]

You can use the BroadcastReceiver library to implement this code.
You can see the constants values here: http://developer.android.com/reference/android/content/Intent.html#ACTION_MEDIA_MOUNTED

 

[touchvip]

Thank for Erel.
Use the BroadcastReceiver solved