0

我的代码拒绝返回正确的 requestCode，所以我即兴创作了一点。它总是返回-1。

    if(v.getId() == R.id.imageButton9)
    {
        request = 888;
        Intent wpIntent = new Intent();
        wpIntent.setType("image/*");
        wpIntent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(wpIntent, "Select Picture"), SELECT_PICTURE);
    }

    else if(v.getId() == R.id.imageButton10)
    {
        String uri = null;
        request = 999;
        rtIntent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);
        rtIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_TYPE, RingtoneManager.TYPE_RINGTONE);
        rtIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_TITLE, "Select Tone");
        if( uri != null)
        {
            rtIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, Uri.parse(uri));
        }
        else
        {
            rtIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, (Uri)null);
        }       
        this.startActivityForResult(rtIntent, SELECT_TONE);
    }

我在代码开头声明了两个变量：

    protected static final int SELECT_PICTURE = 888;
protected static final int SELECT_TONE = 999;

这是 onActivityResult：

    public void onActivityResult(int resultCode, int requestCode, Intent data)
{
    Toast.makeText(this, "onActivityResult: "+requestCode, Toast.LENGTH_SHORT).show();

    if(request == 888)
    {
        Toast.makeText(this, "Picture Selection", Toast.LENGTH_SHORT).show();
        Uri selectedImage = Uri.parse(data.getDataString());
        wpPath = getPath(selectedImage);
        Toast.makeText(this, "WP Path: "+wpPath, Toast.LENGTH_SHORT).show();
        request = 0;
    }

    else if(request == 999)
    {
        Toast.makeText(this, "Tone Selection", Toast.LENGTH_SHORT).show();
        Log.i("RT Picked is: ", rtIntent.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI).toString());
        Uri uri = rtIntent.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);
        if (uri != null) 
        {
            rtPath = uri.toString();
            Toast.makeText(this, "Ringtone Path: "+rtPath, Toast.LENGTH_SHORT).show();
            request = 0;
        }
    }
}

这总是强制关闭。它给出以下错误：

06-01 12:40:35.388: E/AndroidRuntime(7437): java.lang.RuntimeException: 传递结果失败 ResultInfo{who=null, request=999, result=-1, data=Intent { (有额外) }}到活动 {com.asim.autobot/com.asim.autobot.profile}：java.lang.NullPointerException

我被困住了。不能解决这个问题。

首先，为什么requestCode总是返回-1？其次，为什么应用程序强制关闭rtIntent.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);？

编辑：完整的 Logcat http://i47.tinypic.com/1zm2gww.jpg

它指向的 Line 是 Log.i("RT Picked is: ", rtIntent.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI).toString());

4

2 回答 2

2

当你得到一个 resultCode 时，-1它​​的工作原理是RESULT_OK = -1

检查以下行：

rtIntent.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI).toString()

您有一个名为的参数Intent data，您应该使用它而不是rtIntent变量。您的 rtIntent 变量不会被修改，因此getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI)可能会返回 null。

于 2012-06-01T09:38:57.527 回答
0

试试这个代码，

    public void onClick(View v) {

        switch (v.getId()) {
        case R.id.imageButton9:
            request = 888;
            Intent wpIntent = new Intent();
            wpIntent.setType("image/*");
            wpIntent.setAction(Intent.ACTION_GET_CONTENT);
            startActivityForResult(Intent.createChooser(wpIntent, "Select Picture"), SELECT_PICTURE);
        case R.id.imageButton10:

            String uri = null;
            request = 999;
            rtIntent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER);
            rtIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_TYPE, RingtoneManager.TYPE_RINGTONE);
            rtIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_TITLE, "Select Tone");
            if( uri != null)
                {
                    rtIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, Uri.parse(uri));
                }
            else
                {
                    rtIntent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, (Uri)null);
                }       
                        this.startActivityForResult(rtIntent, SELECT_TONE);

            break;
        default:
            break;
        }

    }


       public void onActivityResult(int resultCode, int requestCode, Intent data)
{
    Toast.makeText(this, "onActivityResult: "+requestCode, Toast.LENGTH_SHORT).show();

    if(requestCode == SELECT_PICTURE)
    {
        Toast.makeText(this, "Picture Selection", Toast.LENGTH_SHORT).show();
        Uri selectedImage = Uri.parse(data.getDataString());
        wpPath = getPath(selectedImage);
        Toast.makeText(this, "WP Path: "+wpPath, Toast.LENGTH_SHORT).show();
        request = 0;
    }

    else if(requestCode == SELECT_TONE)
    {
        Toast.makeText(this, "Tone Selection", Toast.LENGTH_SHORT).show();
        Log.i("RT Picked is: ", rtIntent.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI).toString());
        Uri uri = rtIntent.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);
        if (uri != null) 
        {
            rtPath = uri.toString();
            Toast.makeText(this, "Ringtone Path: "+rtPath, Toast.LENGTH_SHORT).show();
            request = 0;
        }
    }
}
于 2012-06-01T08:31:22.963 回答