Question

我使用 ImageView 和 TextView 制作了一个 ListView 。当我点击图片然后使用意图时，我将图片uri 和文字传递给下一个活动。现在首先listView的四个单元格我正在获取下一个活动的正确数据。但是当我滚动listView 然后在listview的某个单元格上单击然后错误的数据将被发送。如果有人知道解决方案，那么请发布它... 提前致谢

这是我的适配器类代码..

 public class Adapter extends BaseAdapter {

private static final String TAG = "Adapter";
private Activity mActivity;
public ArrayList<Data> mObjects;
// /private final Context context;
Context context;

static class ViewHolder {
    static ImageView icon;
    TextView title;
    TextView name;
    TextView review;
    DownloadImageTask mTask;
    String ab[];
    // DownloadImageTask1 mTask1;
    // ImageView photo;
}

public Adapter(Activity activity, Context context, ArrayList<Data> mObjects) {

    this.mActivity = (Activity) activity;
    this.context = context;
    this.mObjects = mObjects;

}

public void setObjects(ArrayList<Data> mObjects) {
    this.mObjects = mObjects;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {

    final Data item = mObjects.get(position);
    View rowView = convertView;

    if (rowView == null) {
        LayoutInflater inflater = mActivity.getLayoutInflater();
        rowView = inflater.inflate(R.layout.item, parent, false);
        ViewHolder viewHolder = new ViewHolder();
        viewHolder.icon = (ImageView) rowView.findViewById(R.id.image);
        // viewHolder.photo = (ImageView) rowView.findViewById(R.id.photo);
        viewHolder.title = (TextView) rowView.findViewById(R.id.title);
        viewHolder.name = (TextView) rowView.findViewById(R.id.name);

        viewHolder.review = (TextView) rowView.findViewById(R.id.status);
        rowView.setTag(viewHolder);
    }

    ViewHolder holder = (ViewHolder) rowView.getTag();

    holder.title.setText(item.getmTitle());
    holder.name.setText(item.getmConcatinate());

    holder.review.setText(item.getmreview());
    holder.icon.setBackgroundResource(R.drawable.ic_ab);
    // holder.photo.setBackgroundResource(0);
    holder.mTask = new DownloadImageTask(item.getmImageUrl(), holder.icon);
    if (!holder.mTask.isCancelled()) {
        holder.mTask.execute();
    }

    ViewHolder.icon.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            Log.d("Parsing JSON Data", "Before user try122222"); // perform
            //Object tag=   v.getTag();
            Log.d("Parsing JSON Data","abc");
            String title = item.getmConcatinate();
            String picture=item.getmImageUrl();   


            Intent intent = new Intent(v.getContext(), LargeView.class);
            Log.d("Parsing JSON Data", "Before user try444444"); 
                intent.putExtra("data", title); 
                Log.d("Parsing JSON Data", "Before user try555555"); 
                intent.putExtra("image3",picture);
                Log.d("Parsing JSON Data", "Before user try66666666"); 
            v.getContext().startActivity(intent);
            Log.d("Parsing JSON Data", "Before user try7777"); 
        }
    });

    // holder.mTask1 = new DownloadImageTask1(item.getmImageUrl1(),
    // holder.photo);
    // if (!holder.mTask1.isCancelled()) {
    // holder.mTask1.execute();
    // }

    return rowView;
}

@Override
public int getCount() {

    return (this.mObjects.size());
}

@Override
public Object getItem(int position) {

    return (this.mObjects.get(position));
}

@Override
public long getItemId(int position) {

    return (position);
}

public AbsListView.RecyclerListener mRecyclerListener = new RecyclerListener() {

    public void onMovedToScrapHeap(View view) {
        ViewHolder viewHolder = (ViewHolder) view.getTag();
        DownloadImageTask imagetask = viewHolder.mTask;
        // DownloadImageTask1 imagetask1 = viewHolder.mTask1;
        if (imagetask != null) {
            imagetask.cancel(true);
        }
        // if (imagetask1 != null) {
        // // imagetask1.cancel(true);
        // }
    }

};

}

下一个活动的代码......

  public class LargeView extends Activity {
//ImageView image4;
//Bitmap bm1;
//String image_url;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_large_view);
    TextView text=(TextView)findViewById(R.id.textView1);
    ImageView  image4=(ImageView)findViewById(R.id.largeimage);
    //Button button=(Button)findViewById(R.id.back99);

    Intent intent2 = getIntent();
    Log.d("Parsing JSON Data", "Before user try12121212112");
    String easyPuzzle = intent2.getExtras().getString("data");
     String image_url= intent2.getExtras().getString("image3");

     text.setText(easyPuzzle);
     BitmapFactory.Options bmOptions1;
        bmOptions1 = new BitmapFactory.Options();
        bmOptions1.inSampleSize = 1;
        LargeImage large=new LargeImage();

        Bitmap bm = large.LoadImage(image_url, bmOptions1);
       image4.setImageBitmap(bm);

     Log.d("Parsing JSON Data", image_url);



}

}

Answer 1

在这种方法中：

  @Override
    public void onClick(View v) {
        Log.d("Parsing JSON Data", "Before user try122222"); // perform
        //Object tag=   v.getTag();
        Log.d("Parsing JSON Data","abc");
        String title = item.getmConcatinate();
        String picture=item.getmImageUrl();   


        Intent intent = new Intent(v.getContext(), LargeView.class);
        Log.d("Parsing JSON Data", "Before user try444444"); 
            intent.putExtra("data", title); 
            Log.d("Parsing JSON Data", "Before user try555555"); 
            intent.putExtra("image3",picture);
            Log.d("Parsing JSON Data", "Before user try66666666"); 
        v.getContext().startActivity(intent);
        Log.d("Parsing JSON Data", "Before user try7777"); 
    }

项目将是您设置的任何内容。

您需要将ViewHolder存储在其他地方，并使用视图标记来存储该项目。然后你可以在这个例程中使用item = v.getTag。

或者，您可以对视图进行子类化并让它存储标记以便在onclick方法中使用。

Answer 2

//我修改了getView（）它会产生欲望结果 //将位置设置为视图的标记并在onclick中检索数据

   @Override
   public View getView(final int position, View convertView, ViewGroup parent) {

    final Data item = mObjects.get(position);
    View rowView = convertView;

    if (rowView == null) {
        LayoutInflater inflater = mActivity.getLayoutInflater();
        rowView = inflater.inflate(R.layout.item, parent, false);
        ViewHolder viewHolder = new ViewHolder();
        viewHolder.icon = (ImageView) rowView.findViewById(R.id.image);
        // viewHolder.photo = (ImageView) rowView.findViewById(R.id.photo);
        viewHolder.title = (TextView) rowView.findViewById(R.id.title);
        viewHolder.name = (TextView) rowView.findViewById(R.id.name);

        viewHolder.review = (TextView) rowView.findViewById(R.id.status);
        rowView.setTag(viewHolder);
    }

    ViewHolder holder = (ViewHolder) rowView.getTag();

    holder.title.setText(item.getmTitle());
    holder.name.setText(item.getmConcatinate());

    holder.review.setText(item.getmreview());
    holder.icon.setBackgroundResource(R.drawable.ic_ab);
    // holder.photo.setBackgroundResource(0);
    holder.mTask = new DownloadImageTask(item.getmImageUrl(), holder.icon);
    if (!holder.mTask.isCancelled()) {
        holder.mTask.execute();
    }

    ViewHolder.icon.setTag(position); // update position because list view recycle

    ViewHolder.icon.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            Log.d("Parsing JSON Data", "Before user try122222"); // perform
            //Object tag=   v.getTag();
            Log.d("Parsing JSON Data","abc");

            int clickedPosition = (Integer)v.getTag();

            Data clickedItem = mObjects.get(clickedPosition);

            String title = clickedItem.getmConcatinate();
            String picture=clickedItem.getmImageUrl();   


            Intent intent = new Intent(v.getContext(), LargeView.class);
            Log.d("Parsing JSON Data", "Before user try444444"); 
                intent.putExtra("data", title); 
                Log.d("Parsing JSON Data", "Before user try555555"); 
                intent.putExtra("image3",picture);
                Log.d("Parsing JSON Data", "Before user try66666666"); 
            v.getContext().startActivity(intent);
            Log.d("Parsing JSON Data", "Before user try7777"); 
        }
    });

    // holder.mTask1 = new DownloadImageTask1(item.getmImageUrl1(),
    // holder.photo);
    // if (!holder.mTask1.isCancelled()) {
    // holder.mTask1.execute();
    // }

    return rowView;
}

Answer 3

您的问题是将onClickListener定义为匿名类。您在课堂上使用的项目可以是任何内容。

@Override
public View getView(final int position, View convertView, ViewGroup parent) {

final Data item = mObjects.get(position);
View rowView = convertView;

if (rowView == null) {
    LayoutInflater inflater = mActivity.getLayoutInflater();
    rowView = inflater.inflate(R.layout.item, parent, false);
    ViewHolder viewHolder = new ViewHolder();
    viewHolder.icon = (ImageView) rowView.findViewById(R.id.image);
    viewHolder.icon.setTag(position);
    // viewHolder.photo = (ImageView) rowView.findViewById(R.id.photo);
    viewHolder.title = (TextView) rowView.findViewById(R.id.title);
    viewHolder.name = (TextView) rowView.findViewById(R.id.name);

    viewHolder.review = (TextView) rowView.findViewById(R.id.status);
    rowView.setTag(viewHolder);
}

ViewHolder holder = (ViewHolder) rowView.getTag();

holder.title.setText(item.getmTitle());
holder.name.setText(item.getmConcatinate());

holder.review.setText(item.getmreview());
holder.icon.setBackgroundResource(R.drawable.ic_ab);
// holder.photo.setBackgroundResource(0);
holder.mTask = new DownloadImageTask(item.getmImageUrl(), holder.icon);
if (!holder.mTask.isCancelled()) {
    holder.mTask.execute();
}

ViewHolder.icon.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        Log.d("Parsing JSON Data", "Before user try122222"); // perform
        //Object tag=   v.getTag();
        Log.d("Parsing JSON Data","abc");
        int pos = Integer.parseInt(v.getTag());
        Data itm = mObjects.get(pos);
        String title = itm.getmConcatinate();
        String picture=itm.getmImageUrl();   


        Intent intent = new Intent(v.getContext(), LargeView.class);
        Log.d("Parsing JSON Data", "Before user try444444"); 
            intent.putExtra("data", title); 
            Log.d("Parsing JSON Data", "Before user try555555"); 
            intent.putExtra("image3",picture);
            Log.d("Parsing JSON Data", "Before user try66666666"); 
        v.getContext().startActivity(intent);
        Log.d("Parsing JSON Data", "Before user try7777"); 
    }
});

意图不从ListView发送下一个活动的正确数据

3 个答案: