android-ImageView

在android上，对于图片集的操作，一张一张可以上下滑动，选择一张图片后调用我们以前写过的android美图秀秀基础篇程序开始编辑。

首先我们应该写个适配器MyAdapter
package com.example.myactivity;

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

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

public class MyAdapter extends BaseAdapter {
    private LayoutInflater mInflater;

    private List<ImageInfo> mImageInfos = new ArrayList<ImageInfo>();

    public MyAdapter() {
    }

    public MyAdapter(Context context, List<ImageInfo> imageInfos) {
        mInflater = LayoutInflater.from(context);
        mImageInfos = imageInfos;
    }

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

    @Override
    public Object getItem(int position) {
        return mImageInfos.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        //position = position+1;
        ViewHolder holder;

        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.item, null);
            holder = new ViewHolder();
            holder.textview = (TextView) convertView.findViewById(R.id.txt);
            holder.imageview = (ImageView) convertView.findViewById(R.id.image);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        holder.imageview.setImageBitmap(BitmapFactory.decodeFile(mImageInfos.get(position).getPath()));
        holder.textview.setText("第" + position + "张");
        return convertView;
    }

    static class ViewHolder {
        TextView textview;
        ImageView imageview;
    }

} 

MainActivity 
package com.example.myactivity;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

public class MainActivity extends Activity {

    private ListView mListView;
    private List<ImageInfo> mImageInfos = new ArrayList<ImageInfo>();
    private MyAdapter myAdapter;

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

        mListView = (ListView) findViewById(R.id.listview);
        getImages(Environment
                .getExternalStorageDirectory());
        myAdapter = new MyAdapter(this, mImageInfos);
        mListView.setAdapter(myAdapter);

        mListView.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // TODO Auto-generated method stub
                Toast.makeText(MainActivity.this, "您选择的是第"+position+"张图片", 1).show();
                String path = mImageInfos.get(position).getPath();
                Intent intent = new Intent();
                intent.setClassName("com.example.test",
                        "com.example.test.CanvasActivity");//调用我们以前写的应用
                intent.putExtra("path", path);
                startActivity(intent);

            }
        });

    }

    private void getImages(File rootPath) {
        // File rootPath =
        // Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
        File[] paths = rootPath.listFiles();
        if (paths != null) {
            for (File path : paths) {
                if (path.isFile() && isOurNeed(path)) {
                    ImageInfo mInfo = new ImageInfo();
                    mInfo.setPath(path.getAbsolutePath());
                    mImageInfos.add(mInfo);
                } else if (path.isDirectory()
                        && !path.getName().equals(".thumbnails")) {
                    getImages(path);
                }
            }
        }
    }

    private boolean isOurNeed(File path) {
        if (path.getName().endsWith(".jpg") || path.getName().endsWith(".png")
                || path.getName().endsWith(".jpeg")) {
            return true;
        }
        return false;
    }

    /*private void getFiles(List<String> fileList, File path) {
        File[] allFiles = path.listFiles();
        for (int i = 0; i < allFiles.length; i++) {
            File file = allFiles[i];
            if (file.isFile() && path.getName().endsWith(".jpg")) {
                fileList.add(file.getAbsolutePath());
            } else if (file.isDirectory()) {
                getFiles(fileList, file);
            }
        }
    }*/

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

ImageInfo
package com.example.myactivity;

public class ImageInfo {

    public int position;
    public String path;
    
    public int getPosition() {
        return position;
    }
    public void setPosition(int position) {
        this.position = position;
    }
    public String getPath() {
        return path;
    }
    public void setPath(String path) {
        this.path = path;
    }

}

我们运行后的结果：

选择一张图片后调用我们之前写过的android应用：