android應用開發之辨別圖片、音頻、視頻數據

白天聽群裡有人說辨別不了圖片，音頻視頻，因為忙沒空寫，回家從代碼中摘取該部分功能,如下：

public void onClick(View v)
    {
        switch (v.getId())
        {
     ... ...
        case R.id.btnControlPointPic:
            Intent srcPicIntent = new Intent();
            srcPicIntent.setType("image/*");
            srcPicIntent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(srcPicIntent, SRCMAIN_GET_FILE_REQUEST_CODE);
            break;
        case R.id.btnControlPointAudio:
            Intent srcAudioIntent = new Intent();
            srcAudioIntent.setType("audio/*");
            srcAudioIntent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(srcAudioIntent, SRCMAIN_GET_FILE_REQUEST_CODE);
            break;
        case R.id.btnControlPointVideo:
            Intent srcVudioIntent = new Intent();
            srcVudioIntent.setType("video/*");
            srcVudioIntent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(srcVudioIntent, SRCMAIN_GET_FILE_REQUEST_CODE);
            break;
        ... ...
        
        default:
            break;
        }
    }