Question

嗨我有图像网格视图的代码，当我点击网格的每个图像时，它打开空布局但我想当我点击第一张图片，所以用更大的尺寸打开它我的意思是调用我点击的相同图像这是主要的代码

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;

public class fitgridview extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fitgridview);
        GridView gridView = (GridView)findViewById(R.id.gridview);
        gridView.setAdapter(new MyAdapter(this));
        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
                // Send intent to SingleViewActivity
                Intent i = new Intent(getApplicationContext(), SingleViewActivity2.class);

                // Pass image index
                i.putExtra("id", position);
                startActivity(i);
            }
        });
    }
}

这是myAdapter java类的代码： -

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

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

/**
 * Created by lenovo on 06/08/2016.
 */
public class MyAdapter extends BaseAdapter {
    private final List<Item> mItems = new ArrayList<Item>();
    private final LayoutInflater mInflater;

    public MyAdapter(Context context) {
        mInflater = LayoutInflater.from(context);

        mItems.add(new Item("Red",       R.drawable.ic_menu_camera));
        mItems.add(new Item("Magenta",   R.drawable.ic_menu_gallery));
        mItems.add(new Item("Dark Gray", R.drawable.ic_menu_manage));
        mItems.add(new Item("Gray",      R.drawable.ic_menu_send));
        mItems.add(new Item("Green",     R.drawable.ic_menu_share));
        mItems.add(new Item("Cyan",      R.drawable.ic_menu_slideshow));
        mItems.add(new Item("Red",       R.drawable.ic_menu_camera));
        mItems.add(new Item("Magenta",   R.drawable.ic_menu_gallery));
        mItems.add(new Item("Dark Gray", R.drawable.ic_menu_manage));
        mItems.add(new Item("Gray",      R.drawable.ic_menu_send));
        mItems.add(new Item("Green",     R.drawable.ic_menu_share));
        mItems.add(new Item("Cyan",      R.drawable.ic_menu_slideshow));

    }

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

    @Override
    public Item getItem(int i) {
        return mItems.get(i);
    }

    @Override
    public long getItemId(int i) {
        return mItems.get(i).drawableId;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        View v = view;
        ImageView picture;
        TextView name;

        if (v == null) {
            v = mInflater.inflate(R.layout.grid_item, viewGroup, false);
            v.setTag(R.id.picture, v.findViewById(R.id.picture));
            v.setTag(R.id.text, v.findViewById(R.id.text));
        }

        picture = (ImageView) v.getTag(R.id.picture);
        name = (TextView) v.getTag(R.id.text);

        Item item = getItem(i);

        picture.setImageResource(item.drawableId);
        name.setText(item.name);

        return v;
    }

    private static class Item {
        public final String name;
        public final int drawableId;

        Item(String name, int drawableId) {
            this.name = name;
            this.drawableId = drawableId;
        }
    }
}

这是SquareImageView java类： -

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * Created by lenovo on 06/08/2016.
 */
public class SquareImageView extends ImageView {
    public SquareImageView(Context context) {
        super(context);
    }

    public SquareImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public SquareImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        setMeasuredDimension(getMeasuredWidth(), getMeasuredWidth()); //Snap to width
    }
}

我点击它后如何调用每个图像？我应该在SingleViewActivity2中写什么来做我想做的事情帮帮我，非常感谢

Answer 1

首先，适配器只保存一个列表。您可以从活动添加对象并在其中传递列表。

在代码中，

// Fields private List<Item> mItems = new ArrayList<Item>(); private MyAdapter mAdapter; // onCreate mAdapter = new MyAdapter(this, mItems); gridView.setAdapter(mAdapter);

现在，如果你改为ArrayAdapter<Item>而不是BaseAdapter，你可以利用一些有用的方法。例如，

mAdapter.add(new Item(...));

现在，建议您研究如何做public class Item implements Parcelable，这超出了本答案的范围。

完成后，您可以在活动
之间传递Parcelable个对象
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() { public void onItemClick(AdapterView<?> parent, View v, int position, long id) { // Send intent to SingleViewActivity Intent i = new Intent(getApplicationContext(), SingleViewActivity2.class); // Pass image item i.putExtra("item", mAdapter.getItem(position)); startActivity(i); } });

Answer 2

将对象从activity传递给适配器，然后渲染。

目前你正在从适配器创建和渲染对象，这是一种编程习惯。

当您从活动传递对象时，您可以将具有意图的对象传递给下一个活动，您将达到您的要求。

这是解决问题的唯一方法。

如何点击android中图像的网格视图

2 个答案: