android - 如何在onActivityResult方法中的自定义listView中添加项目？

Question

我正在使用 Android 相机开发一个简单的视频应用程序。在我的应用程序中，我有一个名为“Make Video”的按钮和一个 ListView ，用于显示我的应用程序录制的视频名称。现在，当我单击“制作视频”按钮时，它会打开我的移动摄像头进行录制，但是当我完成录制时，相机给了我两个选项。 “保存”和“放弃”。现在，通过单击“保存”选项，我想将录制的视频的名称添加到我的 ListView 中。我在这方面开发了一些代码并且工作正常，但我面临的问题是如何在 onActivityResult 方法的 ListView 中添加录制视频的名称并更新我的 ListView 。请帮助我，我将非常感谢你。

您可以在下面查看我的代码。

public class MainActivity extends ListActivity 
{

    private ArrayList<String> cameraVideoList = new ArrayList<String>();

    Context ctx;
//  Resources res;

     int REQUEST_VIDEO_CAPTURED =1;
     Uri uriVideo = null;

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

        ctx = getApplicationContext();


        Button makeVideo = (Button) findViewById(R.id.button1);
        makeVideo.setOnClickListener(new OnClickListener() 
        {
            public void onClick(View v) 
            {
                //Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                Intent intent = new Intent(android.provider.MediaStore.ACTION_VIDEO_CAPTURE);
                startActivityForResult(intent, REQUEST_VIDEO_CAPTURED);

            }
        });

        ListView videoList = getListView();

        videoList.setOnItemClickListener(new OnItemClickListener()
        {
           @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int position,long arg3) 
           {
                Toast.makeText(MainActivity.this, "" + position, Toast.LENGTH_SHORT).show();

            }
        });

        setListAdapter(new ImageAndTextAdapter(ctx, R.layout.list_item_icon_text, cameraVideoList));


    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) 
    {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);

        if (resultCode == RESULT_OK)
        {
            if (requestCode == REQUEST_VIDEO_CAPTURED) 
            {
                uriVideo = data.getData();
//                Toast.makeText(MainActivity.this, uriVideo.getPath(),
//                        Toast.LENGTH_LONG).show();
//                
//                Toast.makeText(MainActivity.this, uriVideo.toString(),
//                        Toast.LENGTH_LONG).show();

                cameraVideoList.add(getFileNameFromUrl(uriVideo.getPath().toString()));

            }
        }
    }

    public String getFileNameFromUrl(String path) 
    {
        String[] pathArray = path.split("/");
        return pathArray[pathArray.length - 1];
    }

    public class ImageAndTextAdapter extends ArrayAdapter<String>
    {
        private LayoutInflater mInflater;
        private ArrayList<String> mStrings;
        private int mViewResourceId;

        public ImageAndTextAdapter(Context context, int textViewResourceId,ArrayList<String> objects) 
        {
            super(context, textViewResourceId, objects);
            mInflater = (LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            mStrings = objects;
            mViewResourceId = textViewResourceId;
        }

        public View getView(int position, View convertView, ViewGroup parent) 
        {
            convertView = mInflater.inflate(mViewResourceId, null);

            ImageView iv = (ImageView)convertView.findViewById(R.id.icon);
            iv.setImageResource(R.drawable.video_icon);

            TextView tv = (TextView)convertView.findViewById(R.id.text);
            tv.setText(mStrings.get(position));

            return convertView;
        }
    }

}

Answer 1

当你走正确的路时，但这里需要一些改变。

1. 当您创建自定义适配器类对象时，该对象不起作用，因为当您更改列表对象中的数据时，您必须通过适配器通知 ListView 内容。

声明ImageAndTextAdapter适配器；作为全局和私有(private)对象

onCreate(){

    adapter = new ImageAndTextAdapter(ctx, R.layout.list_item_icon_text, cameraVideoList);
    videoList.setAdapter(adapter);

}

现在在 onActivityResult 将新记录添加到列表对象后，只需调用适配器类的 notificationDataSetChange() 即可

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{
    // TODO Auto-generated method stub
    super.onActivityResult(requestCode, resultCode, data);

    if (resultCode == RESULT_OK)
    {
        if (requestCode == REQUEST_VIDEO_CAPTURED) 
        {
            uriVideo = data.getData();

            cameraVideoList.add(getFileNameFromUrl(uriVideo.getPath().toString()));

            adapter.notifyDatasetChanged(); // here
        }
    }
}