Question

我的GridView有一个Image和带有灰色的文字，选择任何项目，我需要将文字和图像的灰色更改为其他颜色（橙色），并选择其他颜色网格项我需要将之前选择的项更改为默认的灰色并选择一个为橙色..

我尝试了一些解决方案，但没有得到我的正确输出..请帮我解决这个问题这就是我的尝试：

private int previousSelectedPosition = -1;

 gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                                int position, long id) {
            ImageView selectedImageView = (ImageView) gridView.findViewById(R.id.groupbyImage);
            TextView selectedTextView= (TextView) gridView.findViewById(R.id.groupbyHeader);
            if (previousSelectedPosition != position && previousSelectedPosition!=-1) {
                selectedImageView.setSelected(false);
                // Set the last selected View background color as deselected item
                selectedImageView.setColorFilter(getResources().getColor(R.color.gridsepration));
                // Set the last selected View text color as deselected item
                selectedTextView.setTextColor(getResources().getColor(R.color.gridsepration));
            } else {

                selectedTextView.setTextColor(getResources().getColor(R.color.violet));
                selectedImageView.setColorFilter(getResources().getColor(R.color.violet));
            }
            // Set the current selected view position as previousSelectedPosition
            previousSelectedPosition = position;

        }
    });

最后我得到了解决方案..找到解决方案。

Answer 1

尝试使用此代码它正在运行它是一个示例工作代码，在此选项和网格视图中的项目中，背景颜色随文本颜色一起变化。并且之前选择的项目也被取消选择，就像之前一样。在此我还使用了textview。

下面是网格视图的 xml 代码。

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    tools:context=".MainActivity"
    android:background="#e8594c"
    >
    <TextView
        android:id="@+id/tv_message"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#f85d4f"
        android:layout_marginBottom="15dp"
        android:padding="10dp"
        />
    <GridView
        android:id="@+id/gv"
        android:layout_width="650dp"
        android:layout_height="wrap_content"
        android:padding="2dp"
        android:numColumns="3"
        android:background="#d84521"
        android:verticalSpacing="2dp"
        android:horizontalSpacing="2dp"
        android:stretchMode="columnWidth"
        android:gravity="left"
        android:layout_below="@id/tv_message"
        >
    </GridView>
</RelativeLayout>

现在 java 文件代码如下：

import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.app.Activity;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.GridView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.RelativeLayout.LayoutParams;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import android.content.res.Resources;


public class MainActivity extends Activity {
    private int previousSelectedPosition = -1;

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

        // Get the widgets reference from XML layout
        final GridView gv = (GridView) findViewById(R.id.gv);
        final TextView tv_message = (TextView) findViewById(R.id.tv_message);

        // Initializing a new String Array
        String[] plants = new String[]{
                "Catalina ironwood",
                "Cabinet cherry",
                "Pale corydalis",
                "Pink corydalis",
                "Belle Isle cress",
                "Land cress",
                "Orange coneflower",
                "Coast polypody",
                "Water fern"
        };

        // Populate a List from Array elements
        final List<String> plantsList = new ArrayList<String>(Arrays.asList(plants));

        // Data bind GridView with ArrayAdapter (String Array elements)
        gv.setAdapter(new ArrayAdapter<String>(
                this, android.R.layout.simple_list_item_1, plantsList){
            public View getView(int position, View convertView, ViewGroup parent) {

                // Return the GridView current item as a View
                View view = super.getView(position,convertView,parent);

                // Convert the view as a TextView widget
                TextView tv = (TextView) view;

                // set the TextView text color (GridView item color)
                tv.setTextColor(Color.DKGRAY);

                // Set the layout parameters for TextView widget
                RelativeLayout.LayoutParams lp =  new RelativeLayout.LayoutParams(
                        LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT
                );
                tv.setLayoutParams(lp);

                // Get the TextView LayoutParams
                RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)tv.getLayoutParams();

                // Set the width of TextView widget (item of GridView)
                params.width = getPixelsFromDPs(MainActivity.this,168);

                // Set the TextView layout parameters
                tv.setLayoutParams(params);

                // Display TextView text in center position
                tv.setGravity(Gravity.CENTER);

                // Set the TextView text font family and text size
                tv.setTypeface(Typeface.SANS_SERIF, Typeface.NORMAL);
                tv.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 12);

                // Set the TextView text (GridView item text)
                tv.setText(plantsList.get(position));

                // Set the TextView background color
                tv.setBackgroundColor(Color.parseColor("#FFFF4F25"));

                // Return the TextView widget as GridView item
                return tv;
            }
        });

        gv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                // Get the selected item text
                String selectedItem = parent.getItemAtPosition(position).toString();

                // Display the selected item text to app interface
                tv_message.setText("Selected item : " + selectedItem);

                // Get the current selected view as a TextView
                TextView tv = (TextView) view;

                // Set the current selected item background color
                tv.setBackgroundColor(Color.parseColor("#FF9AD082"));

                // Set the current selected item text color
                tv.setTextColor(Color.BLUE);

                // Get the last selected View from GridView
                TextView previousSelectedView = (TextView) gv.getChildAt(previousSelectedPosition);

                // If there is a previous selected view exists
                if (previousSelectedPosition != -1)
                {
                    // Set the last selected View to deselect
                    previousSelectedView.setSelected(false);

                    // Set the last selected View background color as deselected item
                    previousSelectedView.setBackgroundColor(Color.parseColor("#FFFF4F25"));

                    // Set the last selected View text color as deselected item
                    previousSelectedView.setTextColor(Color.DKGRAY);
                }

                // Set the current selected view position as previousSelectedPosition
                previousSelectedPosition = position;
            }
        });
 }

    // Method for converting DP value to pixels
    public static int getPixelsFromDPs(Activity activity, int dps){
        Resources r = activity.getResources();
        int  px = (int) (TypedValue.applyDimension(
                TypedValue.COMPLEX_UNIT_DIP, dps, r.getDisplayMetrics()));
        return px;
    }
}

此代码的输出为：

之前

在

希望它可以帮助你！

Answer 2

我的模型（网格视图对象）：

你应该放一个布尔变量来知道选择了哪一个。
当你选择其中一个时，你应该将布尔变量设置为true，如果你想要另一张卡将会选择你应该设置false那个网格视图的布尔变量。
任何更改后（如选择其中一个网格视图），您必须致电mAdapter.notifyDataSetChanged();

Answer 3

您需要在模型类中添加一个字段供选择。因此，您可以从适配器的getView（）方法中设置选择。在适配器中使用viewHolder。

public View getView(final int position, View convertView, ViewGroup parent) {
    final ViewHolder holder;

    if (convertView == null) {

        convertView = LayoutInflater.from(context).inflate(
                R.layout.your_row_file, null);

        holder = new ViewHolder();

        holder.selectedImageView = (ImageView) convertView
                .findViewById(R.id.groupbyImage);
        holder.selectedTextView = (TextView) convertView
                .findViewById(R.id.groupbyHeader);

        convertView.setTag(holder);

    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    if (yourArrayList.get(position).getSelected()) {
            selectedTextView.setTextColor(getResources().getColor(R.color.violet));
            selectedImageView.setColorFilter(getResources().getColor(R.color.violet));
        } else {
     // Set the last selected View background color as deselected item 
            selectedImageView.setColorFilter(getResources().getColor(R.color.gridsepration));
            // Set the last selected View text color as deselected item 
            selectedTextView.setTextColor(getResources().getColor(R.color.gridsepration));
     }


    convertView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
        //   =========== Update IsSelected Value in Day Array======

           boolean isSelected=yourArrayList.get(position).getSelected();
           yourArrayList.get(position).setSelected(!isSelected);

           notifyDataSetChanged();
        }
    });
    return convertView;
}

Answer 4

我得到了解决方案，感谢所有回复的人。

这就是我所做的。

在我的adpater

 public HashMap<Integer, Boolean> hashMapSelected;

在我的适配器构造函数

中

     hashMapSelected = new HashMap<>();
    for (int i = 0; i < headers.size(); i++) {
        hashMapSelected.put(i, false);
    }

在我的适配器getView

中

 if (hashMapSelected.get(position) == true) {
        viewHolder.imageView.setColorFilter(ContextCompat.getColor(mContext, R.color.violet));
        viewHolder.textView.setTextColor(ContextCompat.getColor(mContext, R.color.violet));
    } else {
        viewHolder.imageView.setColorFilter(ContextCompat.getColor(mContext, R.color.gridsepration));
        viewHolder.textView.setTextColor(ContextCompat.getColor(mContext, R.color.gridsepration));
    }

清除适配器中其他项目的一个额外方法

 public void makeAllUnselect(int position) {
    hashMapSelected.put(position, true);
    for (int i = 0; i < hashMapSelected.size(); i++) {
        if (i != position)
            hashMapSelected.put(i, false);
    }
}

最后我的网格视图setOnItemClickListener

adapter.makeAllUnselect(position);
adapter.notifyDataSetChanged();

final我的适配器看起来像这样

public class DataAdapter extends BaseAdapter {
   private Context mContext;
   private TypedArray images;
   private List<String> headers;
   public HashMap<Integer, Boolean> hashMapSelected;

public DataAdapter(Context context, TypedArray images, List<String> headers) {
    this.mContext = context;
    this.images = images;
    this.headers = headers;
    hashMapSelected = new HashMap<>();
    for (int i = 0; i < headers.size(); i++) {
        hashMapSelected.put(i, false);
    }
}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return images.length();
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return null;
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return 0;
}

public void makeAllUnselect(int position) {
    hashMapSelected.put(position, true);
    for (int i = 0; i < hashMapSelected.size(); i++) {
        if (i != position)
            hashMapSelected.put(i, false);
    }
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    final ViewHolder viewHolder;

    if (convertView == null) {
        convertView = LayoutInflater.from(mContext).inflate(R.layout.groupby_grid_item, parent, false);
        viewHolder = new ViewHolder(convertView);
        convertView.setTag(viewHolder);

    } else
        viewHolder = (ViewHolder) convertView.getTag();
    viewHolder.textView.setText(headers.get(position));
    viewHolder.imageView.setImageResource(images.getResourceId(position, -1));


    if (hashMapSelected.get(position) == true) {
        viewHolder.imageView.setColorFilter(ContextCompat.getColor(mContext, R.color.violet));
        viewHolder.textView.setTextColor(ContextCompat.getColor(mContext, R.color.violet));
    } else {
        viewHolder.imageView.setColorFilter(ContextCompat.getColor(mContext, R.color.gridsepration));
        viewHolder.textView.setTextColor(ContextCompat.getColor(mContext, R.color.gridsepration));
    }
    return convertView;
}


private class ViewHolder {
    TextView textView;
    ImageView imageView;

    public ViewHolder(View view) {
        textView = (TextView) view.findViewById(R.id.groupbyHeader);
        imageView = (ImageView) view.findViewById(R.id.groupbyImage);
    }
}
}

我的GridView OnItemClick

 gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                                int position, long id) {
            selectedGroupBy = getHeaders().get(position);
            adapter.makeAllUnselect(position);
            adapter.notifyDataSetChanged();
        }
    });

GirdView项目选择和以前选择的项目颜色更改应显示正常颜色

4 个答案: