ViewPager 上的按钮返回错误值

Question

我有一个使用 PagerAdapter 的 ViewPager。在页面上，我有一个 TextView 和一个 Button。我希望按钮从 DataRecord 中提取相关数据（我显然知道我可以从 TextView 中获取它，但这只是我更复杂代码的简化版本，用于说明目的）

ViewPager 工作正常，我可以按预期在屏幕之间滑动。但是，单击该按钮时，它不会显示来自 PagerAdapter 的正确数据。

例如，第一页按预期显示包含 "Data Item 1" 的 TextView，但单击第一页上的按钮 Log.d 显示 "Data Item 3"

我很确定这与寻呼机存储当前不在屏幕上的数据的方式有关，但是不知道怎么解决？

StartActivity 类

public class StartActivity extends Activity {

FullScreenImageAdapter adapter;
ViewPager viewPager;

ArrayList<DataRecord> datalist;


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_fullscreen_view);

    datalist = new ArrayList<DataRecord>();

    viewPager = (ViewPager) findViewById(R.id.pager);

    DataRecord dataRecord = new DataRecord("Data Item 1 ");
    datalist.add(dataRecord);

    dataRecord = new DataRecord("Data Item 2 ");
    datalist.add(dataRecord);

    dataRecord = new DataRecord("Data Item 3");
    datalist.add(dataRecord);


    adapter = new FullScreenImageAdapter(this, datalist);

    viewPager.setAdapter(adapter);
}

public int getCurrentPage() {
    return viewPager.getCurrentItem();
}
}

FullScreenImageAdapter 类

public class FullScreenImageAdapter extends PagerAdapter {
private Activity _activity;
private LayoutInflater inflater;
private ArrayList<DataRecord> dataRecords;
public String info;



public FullScreenImageAdapter (Activity activity,
                               ArrayList<DataRecord> dataRecords) {
    this._activity = activity;
    this.dataRecords = dataRecords;
}

@Override
public int getCount() {
    return this.dataRecords.size();
}



@Override
public boolean isViewFromObject(View view, Object object) {
    return view == ((RelativeLayout) object);
}

@Override
public Object instantiateItem(final ViewGroup container, int position) {

    Button btn;
    TextView textField;

    inflater = (LayoutInflater) _activity
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View viewLayout = inflater.inflate(R.layout.main_screen, container,
            false);

    btn = (Button)  viewLayout.findViewById(R.id.button);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            try {
                Log.d("Info - ", info);
            }
            catch (ActivityNotFoundException e) {
                Log.d("Error", e.toString());
            }
        }
    });



    textField = (TextView) viewLayout.findViewById(R.id.text_field);
    info = dataRecords.get(position).information;
    textField.setText(info);

    ((ViewPager) container).addView(viewLayout);

    return viewLayout;
}

@Override
public void destroyItem(ViewGroup container, int position, Object object) {
    ((ViewPager) container).removeView((RelativeLayout) object);

}
}

Answer 1

使用 btn.setTag 和 v.getTag 获取当前按钮的点击值：

info = dataRecords.get(position).information;
btn.setTag(info);

然后单击按钮从按钮取回值：

public void onClick(View v) {
            try {
                Log.d("Info - ", (String)v.getTag());
            }
            catch (ActivityNotFoundException e) {
                Log.d("Error", e.toString());
            }
        }

ViewPager 上的按钮返回错误值

Button on ViewPager returning wrong value

android

android-viewpager

android-pageradapter