Question

我的Android活动锻炼视图显示嵌套列表视图。父列表的每个对象都显示和练习名称和2个按钮以及子列表视图。第一个父列表元素不显示子项，第二个显示第一个子列表的子列表，第三个显示秒子项。如果你上下猛烈地滚动，第一个父母将显示第三个孩子列表。

在开始时看起来像这样： enter image description here

滚动暴力之后，它看起来像这样： enter image description here

我的XML有三个文件

activity_workout_view.xml是第一个：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.franzene.workoutplanner.WorkoutView">

<ListView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/listview"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:verticalSpacing="1dp"
    android:horizontalSpacing="1dp"
    android:stretchMode="columnWidth"
   android:layout_alignParentBottom="true"
    />


</RelativeLayout>

id / listview使用activity_workout_view_listview.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">


<TextView
    android:id="@+id/list_item_string"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:paddingLeft="8dp"
    android:textSize="18sp"
    android:textStyle="bold"
    />

<Button
    android:id="@+id/delete_btn"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_alignParentRight="true"
    android:layout_marginRight="0dp"
    android:text="Dele"
    />

<Button
    android:id="@+id/add_btn"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_toLeftOf="@id/delete_btn"
    android:layout_marginRight="0dp"
    android:text="Add"
    />

<ListView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/listview2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:columnWidth="200dp"
    android:verticalSpacing="1dp"
    android:horizontalSpacing="1dp"
    android:stretchMode="columnWidth"
    android:layout_below="@id/delete_btn"
    android:layout_alignParentBottom="true"
    />
</RelativeLayout>

WorkoutViewAdapterListView.java是父列表的适配器，包含子列表的适配器：

public class WorkoutViewAdapterListView extends BaseAdapter {

DatabaseHelper db;
private Context context;
// private String[] text = {"hi","d"};
private int testInt = 0;
List<WorkoutExercise> WE_TABLE;
MyThumbnaildapter thadapter = null;


public WorkoutViewAdapterListView(Context context, int i) {
    this.context = context;
    testInt = i;
    db = new DatabaseHelper(context);
    WE_TABLE = db.getWorkoutExercise(i + "");

    db.closeDB();


}

public int getCount() {
    //Log.e("Test" , "COUNT: " + totalSetCount + " + " + WE_TABLE.size() );
    return WE_TABLE.size();
}

public Object getItem(int position) {
    return null;
}

public long getItemId(int position) {
    return position;
}

private int[] getLocation(int i) {
    db = new DatabaseHelper(context);

    int temp[] = {-1, -1};

    int count = -1;
    for (int we = 0; we < WE_TABLE.size(); we++) {
        for (int s = 0; s < db.getSetCountByWEID(WE_TABLE.get(we).getID()) + 1; s++) {
            count++;

            if (count == i) {
                //Log.e("Test","WE: " + we+ " S: " + s + " For: " + i);
                temp[0] = we;
                temp[1] = s;
                db.closeDB();
                return temp;
            }

        }
    }
    db.closeDB();
    return temp;
}

public class MyThumbnaildapter extends ArrayAdapter<SetTable> {
    ArrayList<SetTable> arr;
    private TextView text;

    public MyThumbnaildapter(Context context, int textViewResourceId, ArrayList<SetTable> arr) {
        super(context, textViewResourceId, arr);
        this.arr = arr;
    }

    public int getCount() {
        return arr.size();
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        TextView tv;
        View view = convertView;
        // if (view == null) {
        Log.e("Test","VIEWPOSITION:" + position);

        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.activity_workout_view_gridview_set, null);
        Button delButton = (Button) view.findViewById(R.id.delete_btn2);
        delButton.setTag(position);
        tv = new TextView(context);
        tv.setLayoutParams(new ListView.LayoutParams(ListView.LayoutParams.FILL_PARENT, ListView.LayoutParams.WRAP_CONTENT));
        tv = (TextView) view.findViewById(R.id.list_item_string2);
        delButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.e("Test","buttonclick:" + position);

                int id = (Integer) v.getTag();
                arr.remove(id);
                notifyDataSetChanged();
            }
        });
        tv.setText(arr.get(position).getWeight() + "lbs " + arr.get(position).getReps() + "times ");
        Log.e("Test", "view text:" + tv.getText());
        view.setBackgroundColor(Color.parseColor("#FE642E"));

        //}
        return view;
    }

}

public View getView(final int position, View convertView, ViewGroup parent) {
    TextView tv;
    View view = convertView;
    ListView NumberList;


    // if (view == null) {


    db = new DatabaseHelper(context);
    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    //view.setBackgroundDrawable(ColorDrawable("#e74c3c");
    // LinearLayout linearLayout = (LinearLayout)(R.id.layout);

    view = inflater.inflate(R.layout.activity_workout_view_listview, null);
    tv = new TextView(context);
    tv.setLayoutParams(new GridView.LayoutParams(GridView.LayoutParams.FILL_PARENT, GridView.LayoutParams.WRAP_CONTENT));
    Button deleteBtn = (Button) view.findViewById(R.id.delete_btn);

    ArrayList<SetTable> S_TABLE = db.getSets(WE_TABLE.get(position).getID() + "");
    ListView listView = (ListView) view.findViewById(R.id.listview2);
    listView.setAdapter(thadapter);


    ViewGroup.LayoutParams layoutParams = listView.getLayoutParams();

    int h = listView.getCount() * listView.getMeasuredHeight();
    layoutParams.height = h;
    listView.setLayoutParams(layoutParams);

    thadapter = new MyThumbnaildapter(context, R.layout.activity_workout_view_gridview_set, S_TABLE);

    int totalHeight = 0;

    for (int i = 0; i < thadapter.getCount(); i++) {
        View mView = thadapter.getView(i, null, listView);

        mView.measure(
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),

                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));

        totalHeight += mView.getMeasuredHeight();

    }

    ViewGroup.LayoutParams params = listView.getLayoutParams();
    params.height = totalHeight
            + (listView.getDividerHeight() * (thadapter.getCount() - 1));
    listView.setLayoutParams(params);
    listView.requestLayout();


    tv = (TextView) view.findViewById(R.id.list_item_string);
    //Log.e("Test", "Location: " + location[0] + " , " + location[1] + " Number " + Obj);


    String Exercises = WE_TABLE.get(position).getExerciseName();

    view.setBackgroundColor(Color.parseColor("#e74c3c"));
    //deleteBtn.setVisibility(View.GONE);

    tv.setText(Exercises);


    db.closeDB();

    //}

    return view;


  }
}

Answer 1

您不应在ListView项目中使用ListView。

看看http://developer.android.com/reference/android/widget/ExpandableListView.html 这似乎是你在寻找的。

Answer 2

我可能错了，但列表中的列表设计并不是很好。当您快速滚动时，您可能会在回收视图中遇到大量争用。请记住，每次滚动时，“getView”都会被调用到该列表的回收视图。然后，对于每个项目，它需要调用第二个列表的getView并回收所有这些视图..

此外，这将导致一些焦点问题。当您单击第二个“嵌套”列表中的按钮时...是否单击了嵌套列表按钮？第二个清单的清单项目？或者父列表的列表项？我希望你能看到你会遇到一些问题。

我可能建议您进行设置以便进行设置，以便单击一个列表项，该列表项转换为另一个活动，其中包含您执行的每个练习的单个列表视图？

除此之外......我注意到你没有使用正确的设计模式来获取视图。你在每次调用get view时都在膨胀新的布局。这是一个令人难以置信的资源困难...我可以想象它对于嵌套列表视图会很糟糕。您应该使用视图持有者并检查视图是否为空。如果它为null，则根据需要扩展布局并获取其他资源。然后，如果它不为null，则应从视图持有者中提取引用。

阅读本文档，了解如何合并此设计模式。 https://www.codeofaninja.com/2013/09/android-viewholder-pattern-example.html

为什么ListView没有显示正确的元素？

2 个答案: