使用路径列表视图中显示照片 [英] Show photo in listview using path

问题描述

我想展示我在ListView所有照片。我有一个SQLite数据库，其中i保存图片的路径，现在我想知道我怎样才能显示图像。我已经知道如何将路径转换为位图，但我真的没有IDEIA如何把它在ListView

I am trying to show all my pictures in a listview. I have an sqlite db where i save the image's path and now i wanted to know how can i show the image. I already know how to convert the path in a bitmap but i really have no ideia how to put it in the listview

File imgFile = new  File(caminhoNovo);
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.RGB_565;
options.inSampleSize = 4;
    //This is the path already converted to image
Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath(),options); 
ImageView myImage = (ImageView) findViewById(R.id.imageView1);
myImage.setImageBitmap(myBitmap);

现在，我有照片标题列表视图，当我在标题点击图片出现在一个ImageView的，但我想显示图像。有谁知道我怎么能做到这一点或者没有人知道比列表视图更好的方式来显示图像，我怎么能做到这一点？

Right now i have a listview with the photos title and when i click in the title the image appears in an imageview but i wanted to show the images. Does anyone know how can i do that or does anyone know a better way than a listview to show the images and how can i do that??

推荐答案

图像显示在一个XML

image View in an xml

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

<ImageView
    android:id="@+id/imageView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:layout_marginLeft="30dp"
    android:src="@drawable/ic_launcher" />

</RelativeLayout>

主要活动XML

main activity xml

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

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:text="List of Images"
    android:textAppearance="?android:attr/textAppearanceMedium" />

<ListView
    android:id="@+id/listView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/textView1"
    android:layout_centerHorizontal="true" >
</ListView>

</RelativeLayout>

主要活动类：ImageListView，我表明是在**水库 - >绘制-MDPI文件夹

Main Activity class: ImageListView, I am showing the images that are in the **res->drawable-mdpi folder

import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;

public class ImageListView extends Activity {

    private ImageAdapter adapter;
    private ListView imageList;

    private ArrayList<Integer> imagePaths= new ArrayList<Integer>(); // Edit your code here..

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.image_listview);

        // Edit your code here..
        imagePaths.add(R.drawable.image1);
        imagePaths.add(R.drawable.image2);
        imagePaths.add(R.drawable.image3);

        imageList= (ListView) findViewById(R.id.listView1);
        adapter= new ImageAdapter(getBaseContext(), imagePaths);
        imageList.setAdapter(adapter);      
    }
}

自定义适配器：ImageAdapter

Custom Adapter: ImageAdapter

import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;

public class ImageAdapter extends BaseAdapter {

    static class RowItemHolder{
        ImageView imageView;
    }
    private Context context;
    private ArrayList<Integer> imagePaths= new ArrayList<Integer>();

    public ImageAdapter(Context baseContext, ArrayList<Integer> imagePaths) {
    // TODO Auto-generated constructor stub
        this.context= baseContext;
        this.imagePaths= imagePaths;
    }

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

    @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;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    View view;
    view= convertView;
    RowItemHolder holder = null;
    if(view== null){
            LayoutInflater in =(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = in.inflate(R.layout.image_view, parent, false);
            holder= new RowItemHolder();
            holder.imageView=(ImageView) view.findViewById(R.id.imageView1);
        view.setTag(holder);
    } else{
            holder = (RowItemHolder) view.getTag();
    }
    //Edit the code here according to you needs.. 
    //like creating option and converting to Bitmap, 
    //or you can do this job in the main activity.
    holder.imageView.setImageResource(imagePaths.get(position));
    return view;
}
}

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