动态创建图像视图网格

Question

好的，所以我正处于偏头痛点，感觉无论我尝试做什么，我都在违背常规。

如何获得图像视图的网格视图（使用下面的数组适配器从位图中覆盖）以在动态数量的列和行中并排显示，它们之间没有间距？

public class GameAdapter extends BaseAdapter {

//Variable setup
private Context context;
private Bitmap[] values;

//Construct the image parameter, get context, the array of images, and the height/width of them
public GameAdapter(Context context, Bitmap[] _values) {
    this.context = context;
    this.values = _values;
}

//Convert Dp to pixels for modularity
private int dpToPx(int dp)
{
    float density = context.getResources().getDisplayMetrics().density;
    return Math.round((float)dp * density);
}

@Override
public int getCount() {
    return values.length;
}

@Override
public Object getItem(int i) {
    return values[i];
}

@Override
public long getItemId(int i) {
    return values[i].getGenerationId();
}

@Override
public View getView(int i, View view, ViewGroup viewGroup) {
    ImageView imageView = new ImageView(context);
    imageView.setImageBitmap(values[i]);
    imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
  //  int pad = dpToPx(1);
//    imageView.setPadding(pad,pad,pad,pad);
//      Log.w("Derp", "" + "Height- "+values[i].getHeight());
//    Log.w("Derp", "" + "Width- "+values[i].getWidth());
    imageView.setLayoutParams(new GridView.LayoutParams(values[i].getWidth(), values[i].getHeight()));
    return imageView;
}


}

Answer 1

要在运行时获得最佳性能，您应该执行以下小技巧：创建一个 AsyncTask 来加载您的 ImageView 并将它们设置为 null。

final ImageView imageView = (ImageView)   
view.findViewById(R.id.image);  

// Set the ImageView to null
imageView.setImageBitmap(null);  

new AsyncTack<String, Void, Bitmap>() {

    protected Bitmap doInBackground(String... params) {  
        String url = params[0];  
        Bitmap bitmap = downloadBitmap(url);  
        return bitmap;  
    } 

    // Set the ImageView with the Bitmap downloaded
    protected void onPostExecute(Bitmap bitmap) {  
        imageView.setImageBitmap(bitmap);  
    }. 

}.execute(url);  

要动态创建GridView，您应该阅读这个SO问题：
Android dynamic GridView

GridView grid = new GridView(this);  
grid.setId(215236);  
grid.setLayoutParams(new GridView.LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));  
grid.setBackgroundColor(Color.WHITE);  
grid.setColumnWidth(GridView.AUTO_FIT);  
grid.setStretchMode(GridView.STRETCH_COLUMN_WIDTH);    

如果你想动态去除每行和每列的间距（垂直和水平），你应该尝试：

gridview.setVerticalSpacing(0);  
gridview.setHorizontalSpacing(0);  

要使行/列的宽度/高度与ImageView 的宽度/高度一致，您可以将GridView 放入LinearLayout（将其设置为 MATCH_PARENT）并将此布局的 getMeasured 设置为知道其中包含多少ImageViews。
查看这些答案以获取有关此技巧的更多信息：
Android: How does GridView auto_fit find the number of columns?

希望这就是你要找的。​​p>

Answer 2

gridview 图像请参考以下内容：

grid_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/grid_view"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:numColumns="auto_fit"
    android:columnWidth="90dp"
    android:horizontalSpacing="10dp"
    android:verticalSpacing="10dp"
    android:gravity="center"
    android:stretchMode="columnWidth" >  

</GridView>

ImageAdapter.java

package com.imagesample;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;


 public class ImageAdapter extends BaseAdapter {
     private Context mContext;

     // all Images in array
         public Integer[] mThumbIds = {
             R.drawable.p1, R.drawable.p2,
             R.drawable.p3, R.drawable.p4,
             R.drawable.p5, R.drawable.p6,
             R.drawable.p7, R.drawable.p8,
             R.drawable.p9, R.drawable.p10,
             R.drawable.p11, R.drawable.p12,
            R.drawable.p13, R.drawable.p14,
             R.drawable.p15
     };

     // Constructor
     public ImageAdapter(Context c){
         mContext = c;
     }

     @Override
     public int getCount() {
        return mThumbIds.length;
     }

     @Override
     public Object getItem(int position) {
         return mThumbIds[position];
     }

     @Override
     public long getItemId(int position) {
         return 0;
     }

     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
         ImageView imageView = new ImageView(mContext);
        imageView.setImageResource(mThumbIds[position]);
         imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        imageView.setLayoutParams(new GridView.LayoutParams(70, 70));
         return imageView;
     }   }

GridActivity.java

package com.imagesample;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;

public class GridActivity extends Activity {

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

        GridView gridView = (GridView) findViewById(R.id.grid_view);

        // Instance of ImageAdapter Class
        gridView.setAdapter(new ImageAdapter(this));
    }
}

希望对你有很大帮助。