Android 如何在gridview上添加图像？

在下面的gridview

image.png

中，图像是从

drawable

文件夹中获取的。现在，我希望将照片库中的图像或捕获的相机图像动态添加到此网格中。如何操作

有没有示例代码

HelloGridView类：

package com.example.HelloGridView; 

import android.app.Activity; 
import android.os.Bundle; 

public class HelloGridView extends Activity { 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    GridView gridview = (GridView) findViewById(R.id.gridview); 
    gridview.setAdapter(new ImageAdapter(this)); 

    gridview.setOnItemClickListener(new OnItemClickListener() { 
        public void onItemClick(AdapterView<?> parent, View v, int position, long id) { 
            Toast.makeText(HelloGridView.this, "" + position, Toast.LENGTH_SHORT).show(); 
        } 
    }); 
    } 

---

将图像放入SD卡中的文件夹[图像]

public class ChannelImageAdapter extends BaseAdapter {

    int mGalleryItemBackground;
    private Context mContext;
    File[] images;
    File[] files;
    public ChannelImageAdapter(Context c, int folderID) {
        mContext = c;

        File dir = new File(Environment.getExternalStorageDirectory() + "/images");
        files = dir.listFiles();
        images = files[folderID].listFiles();

    }
    public int getCount() {
        return images.length;
    }
    public Object getItem(int position) {
        return images[position].getAbsolutePath();
    }
    public long getItemId(int position) {
        return position;
    }
    public String getAlbumName(int folderID) {
        return files[folderID].getName();
    }
    public View getView(int position, View convertView, ViewGroup parent) {

        ImageView imageView;
        //Bitmap bm = BitmapFactory
        //      .decodeFile(images[position].getAbsolutePath());
        if (convertView == null) {
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(100, 100));
            imageView.setScaleType(ImageView.ScaleType.FIT_XY);
            imageView.setPadding(5, 10, 5, 10);
        } else {
            imageView = (ImageView) convertView;
        }
        imageView.setImageBitmap(Bitmap.decode(images[position].getAbsoluteFile()));
        return imageView;

    }


}

---

将图像放入SD卡中的文件夹[图像]

public class ChannelImageAdapter extends BaseAdapter {

    int mGalleryItemBackground;
    private Context mContext;
    File[] images;
    File[] files;
    public ChannelImageAdapter(Context c, int folderID) {
        mContext = c;

        File dir = new File(Environment.getExternalStorageDirectory() + "/images");
        files = dir.listFiles();
        images = files[folderID].listFiles();

    }
    public int getCount() {
        return images.length;
    }
    public Object getItem(int position) {
        return images[position].getAbsolutePath();
    }
    public long getItemId(int position) {
        return position;
    }
    public String getAlbumName(int folderID) {
        return files[folderID].getName();
    }
    public View getView(int position, View convertView, ViewGroup parent) {

        ImageView imageView;
        //Bitmap bm = BitmapFactory
        //      .decodeFile(images[position].getAbsolutePath());
        if (convertView == null) {
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(100, 100));
            imageView.setScaleType(ImageView.ScaleType.FIT_XY);
            imageView.setPadding(5, 10, 5, 10);
        } else {
            imageView = (ImageView) convertView;
        }
        imageView.setImageBitmap(Bitmap.decode(images[position].getAbsoluteFile()));
        return imageView;

    }


}

---

你最好检查这个：你最好检查这个：请尝试解释这个代码是如何工作的，为什么工作的，这样所有用户都可以从中学习。请尝试解释这个代码是如何工作的，为什么工作的，这样所有用户都可以从中学习。

public class ChannelImageAdapter extends BaseAdapter {

    int mGalleryItemBackground;
    private Context mContext;
    File[] images;
    File[] files;
    public ChannelImageAdapter(Context c, int folderID) {
        mContext = c;

        File dir = new File(Environment.getExternalStorageDirectory() + "/images");
        files = dir.listFiles();
        images = files[folderID].listFiles();

    }
    public int getCount() {
        return images.length;
    }
    public Object getItem(int position) {
        return images[position].getAbsolutePath();
    }
    public long getItemId(int position) {
        return position;
    }
    public String getAlbumName(int folderID) {
        return files[folderID].getName();
    }
    public View getView(int position, View convertView, ViewGroup parent) {

        ImageView imageView;

        if (convertView == null) {
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(100, 100));
            imageView.setScaleType(ImageView.ScaleType.FIT_XY);
            imageView.setPadding(5, 10, 5, 10);
        } else {
            imageView = (ImageView) convertView;
        }
        imageView.setImageBitmap(Bitmap.decode(images[position].getAbsoluteFile()));
        return imageView;

    }
}