Android flickr 工具类

Android flickr 工具类

得到Json的 字节输入流，Byte数组输出流，JSON的字符串。
http://cdefgab.web.fc2.com/song.json  JSON文件样本。


package com.example.java.m1115a.Tools;

import android.content.Context;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Created by java on 2016/11/15.
 */

public class HttpTools {
    private String url_path;
    private Context context;

    public HttpTools(String url_path) {
        this.url_path = url_path;
    }

    public HttpTools(String url_path, Context context) {
        this.url_path = url_path;
        this.context = context;
    }

    public InputStream getnetInputStream() throws Exception {
        URL url = new URL(url_path);
        HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
        httpURLConnection.setConnectTimeout(10000);
        httpURLConnection.setReadTimeout(10000);
        httpURLConnection.setDoInput(true);
        httpURLConnection.setRequestMethod("GET");

        InputStream inputStream = null;
        if (httpURLConnection.getResponseCode() == 200) {
            inputStream = httpURLConnection.getInputStream();
        }
        return inputStream;
    }

    public ByteArrayOutputStream getbyteArrayOutputStream() throws Exception {
        InputStream inputStream = getnetInputStream();
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        byte[] buff = new byte[1024];
        int len = 0;
        while ((len = inputStream.read(buff)) != -1) {
            byteArrayOutputStream.write(buff, 0, len);
        }
        inputStream.close();
        return byteArrayOutputStream;
    }

    public String getjsonString() throws Exception {
        ByteArrayOutputStream byteArrayOutputStream = getbyteArrayOutputStream();
        return byteArrayOutputStream.toString();
    }
}

继承HttpTools类

得到JSON的数字HashMap，得到Item的图片URL，得到图片的Bitmap

package com.example.java.m1115a.Tools;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import org.json.JSONArray;

import org.json.JSONObject;

import java.io.ByteArrayOutputStream;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

import java.util.HashMap;

import java.util.Iterator;

/**

 * Created by java on 2016/11/15.

 */

public class GetJson extends HttpTools {

    public GetJson(String url_path) {

        super(url_path);

    }

    public HashMap<Integer, HashMap> jsonMap() throws Exception {

        String jsonString = getjsonString();

        JSONObject jsonObject = new JSONObject(jsonString);

        JSONObject jsonObject1 = jsonObject.getJSONObject("photos");

        JSONArray jsonArray = jsonObject1.getJSONArray("photo");

        HashMap<Integer, HashMap> jMap = new HashMap<Integer, HashMap>();

        for (int i = 0; i < jsonArray.length(); i++) {

            HashMap<String, String> item = new HashMap<String, String>();

            JSONObject jsonObject2 = jsonArray.getJSONObject(i);

            Iterator<String> iterator = jsonObject2.keys();

            while (iterator.hasNext()) {

                String temp = iterator.next();

                item.put(temp, jsonObject2.getString(temp));

            }

            jMap.put(i, item);

        }

        return jMap;

    }

    public static String img_url(HashMap<String, String> item_hashMap) throws Exception {

        /*

        *

        * https://farm{farm-id}.staticflickr.com/{server-id}/{id}_{secret}.jpg

        * https://farm{farm-id}.staticflickr.com/{server-id}/{id}_{secret}_[mstzb].jpg

        * https://farm{farm-id}.staticflickr.com/{server-id}/{id}_{o-secret}_o.(jpg|gif|png)

        *

        * String farmid = item_hashMap.get("farm");

        * String Serverid = item_hashMap.get("server");

        * String id = item_hashMap.get("id");

        * String secret = item_hashMap.get("secret");

        * String img_url = "https://farm" + farmid + ".staticflickr.com/" + Serverid + "/" + id + "_" + secret + ".jpg";

        * System.out.println(img_url);

        */

        HashMap<String, String> temp_map = item_hashMap;

        return "https://farm" + item_hashMap.get("farm") + ".staticflickr.com/" + item_hashMap.get("server") + "/" + item_hashMap.get("id") + "_" + item_hashMap.get("secret") + ".jpg";

    }

    public static Bitmap getBitmap(String img_url) throws Exception {

        URL url = new URL(img_url);

        HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();

        httpURLConnection.setConnectTimeout(10000);

        httpURLConnection.setReadTimeout(10000);

        httpURLConnection.setDoInput(true);

        httpURLConnection.setRequestMethod("GET");

        Bitmap bitmap = null;

        if (httpURLConnection.getResponseCode() == httpURLConnection.HTTP_OK) {

            InputStream inputStream = httpURLConnection.getInputStream();

            if (inputStream != null) {

                byte[] buf = new byte[1024];

                int len = 0;

                ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();

                while ((len = inputStream.read(buf)) != -1) {

                    byteArrayOutputStream.write(buf, 0, len);

                    byteArrayOutputStream.flush();

                }

                bitmap = BitmapFactory.decodeByteArray(byteArrayOutputStream.toByteArray(), 0, byteArrayOutputStream.size());
                inputStream.close();
                byteArrayOutputStream.close();

            }

        }

        return bitmap;

    }

}

完成的例子，测试

每按一次按键，更换下一张图片。

应该不需要每次后 New URL.

package com.example.java.m1115a;

import android.graphics.Bitmap;

import android.os.AsyncTask;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.Toast;

import com.example.java.m1115a.Tools.GetJson;

public class MainActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Button bt = (Button) findViewById(R.id.button);

        bt.setOnClickListener(new View.OnClickListener() {

            private int cont;

            @Override

            public void onClick(View v) {

                new img().execute("http://cdefgab.web.fc2.com/song.json", String.valueOf(cont));

                cont++;

            }

        });

    }

    public class img extends AsyncTask<String, Integer, Bitmap> {

        @Override

        protected Bitmap doInBackground(String... params) {

            GetJson json = new GetJson(params[0]);

            int cont = Integer.parseInt(params[1]);

            Bitmap bitmap = null;

            try {

                bitmap = GetJson.getBitmap(GetJson.img_url(json.jsonMap().get(cont)));

            } catch (Exception e) {

                e.printStackTrace();

            }

            return bitmap;

        }

        @Override

        protected void onPostExecute(Bitmap bitmap) {

            super.onPostExecute(bitmap);

            if (bitmap == null) {

                Toast.makeText(MainActivity.this, "noImg", Toast.LENGTH_SHORT).show();

            }

            ImageView iv = (ImageView) findViewById(R.id.imageView);

            iv.setImageBitmap(bitmap);

        }

    }

}

2016/11/18
也可以直接加载InputStream的方式
bitmap = BitmapFactory.decodeStream(HttpTool.gis("http://s.nownews.com/media_crop/119027/hash/22/c9/22c9873afe491faf76ee832b96dbfec8.JPG"));