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   源码介绍

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package com.example.homeworkhttpgetimage;

import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.media.ThumbnailUtils;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.preference.DialogPreference;
import android.provider.Settings.System;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.Button;
import android.widget.EditText;
import android.widget.GridView;
import android.widget.LinearLayout;
import android.widget.Toast;

import com.example.homeworkhttpgetimage.adapter.MyGriadAdapter;
import com.example.homeworkhttpgetimage.bean.DataBean;
import com.example.homeworkhttpgetimage.bean.JsonBean;
import com.example.homeworkhttpgetimage.downloadService.ServiceForDownload;
import com.google.gson.Gson;

@SuppressLint("HandlerLeak")
public class MainActivity extends Activity implements OnClickListener {
	Button button_search;
	Button button_next;
	EditText editText;
	private static final int DOWN_ID = 0; 
	ProgressDialog dialog;
	GridView gridView;
	List<Bitmap> bitmaps = new  ArrayList<Bitmap>();
	List<DataBean> beans = new ArrayList<DataBean>();
	MyGriadAdapter adapter;
	String value = "";
	int ab = 0;
	LinearLayout layout;
	int pag = 0;// 当前显示第几页
	String allURL[];
	ServiceConnection connection = new ServiceConnection() {
		
		@Override
		public void onServiceDisconnected(ComponentName arg0) {
			// TODO Auto-generated method stub
			
		}
		
		@Override
		public void onServiceConnected(ComponentName arg0, IBinder arg1) {
			// TODO Auto-generated method stub
			
		}
	};
	
	
	Handler handler = new Handler(){
		@Override
		public void handleMessage(Message msg) {
			if(msg.what ==0){
				adapter = new MyGriadAdapter(bitmaps,MainActivity.this);
				gridView.setAdapter(adapter);
				dialog.dismiss();
				
				button_search.setClickable(true);
			}
			
		};
		
	};
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		setTitle("图片搜索引擎");

		button_search = (Button) findViewById(R.id.button1);
		button_next = (Button) findViewById(R.id.button_next);
		editText = (EditText) findViewById(R.id.editText1);
		gridView = (GridView) findViewById(R.id.gridView1);
		registerForContextMenu(gridView);
		layout = (LinearLayout) findViewById(R.id.layout_home_bottom);
		button_next.setOnClickListener(this);
		button_search.setOnClickListener(this);

	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
	
	@Override
	public void onCreateContextMenu(ContextMenu menu, View v,
			ContextMenuInfo menuInfo) {
		
		super.onCreateContextMenu(menu, v, menuInfo);
		menu.setHeaderTitle("快使用双节棍");
		menu.add(0, DOWN_ID, 0, "保存");
	}
	
	@Override
	public boolean onContextItemSelected(MenuItem item) {
		// TODO Auto-generated method stub
		AdapterView.AdapterContextMenuInfo info =(AdapterContextMenuInfo) item.getMenuInfo();
		if(item.getItemId()==DOWN_ID){
			Intent intent = new Intent(this, ServiceForDownload.class);
			String downURL = beans.get(info.position).getObjURL().toString();
			Log.v("this", "onContextItemSelected    获取的地址：" downURL);
			intent.putExtra("key", downURL);
			startService(intent);
			bindService(intent, connection, 0);
			
		}
		
		return super.onContextItemSelected(item);
	}

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		String getText = editText.getText().toString().trim();
		
		if(getText!=""){
			value = getText;
			Log.v("this", value "---为获取的值----");
		}else{
			Toast.makeText(this, "不能为空！", Toast.LENGTH_SHORT).show();
		}
		if(v == button_search){
			button_search.setClickable(false);
			dialog = new ProgressDialog(this);
//			dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
			dialog.setMessage("正在努力加载中···");
			dialog.setCancelable(false);
			dialog.show();
			
			new Thread(){
				public void run() {
					
					String url = "http://image.baidu.com/i?tn=baiduimagejson&ie=utf-8&ic=0&rn=12&pn=1&word=" value;
					DefaultHttpClient client = new DefaultHttpClient();
					HttpGet get = new HttpGet(url);
					try {
						HttpResponse response = client.execute(get);
						int statusCode = response.getStatusLine().getStatusCode();
						if(statusCode == 200){
							String getUrl =  getURL(response);
							Gson gson = new Gson();
							JsonBean bean =gson.fromJson(getUrl, JsonBean.class);
							allURL = new String[bean.getData().size()];
							beans= bean.getData();
							for(int i = 0 ; i<beans.size()-1;i  ){
								Log.v("this", i "-----" beans.get(i).getObjURL());
								getBitmap1(beans.get(i).getObjURL());
							}
							
							Log.v("this", "执行handler----1--设置adapter");
							handler.obtainMessage(0).sendToTarget();
							
						}else{
							
						}
					} catch (Exception e) {
						// TODO Auto-generated catch block
						Log.e("this","onclick     " e);
						e.printStackTrace();
					}
					
				};
				
				
			}.start();
			layout.setVisibility(View.VISIBLE);
			
			
		}else if(v == button_next){
			pag  ;
			new Thread(){
				public void run() {
					
					String url = "http://image.baidu.com/i?tn=baiduimagejson&ie=utf-8&ic=" pag "&rn=12&pn=1&word=" value;
					DefaultHttpClient client = new DefaultHttpClient();
					HttpGet get = new HttpGet(url);
					try {
						HttpResponse response = client.execute(get);
						int statusCode = response.getStatusLine().getStatusCode();
						if(statusCode == 200){
							String getUrl =  getURL(response);
							Gson gson = new Gson();
							JsonBean bean =gson.fromJson(getUrl, JsonBean.class);
							allURL = new String[bean.getData().size()];
							beans= bean.getData();
							for(int i = 0 ; i<beans.size()-1;i  ){
								Log.v("this", i "-----" beans.get(i).getObjURL());
								getBitmap1(beans.get(i).getObjURL());
							}
							
							Log.v("this", "执行handler----1--设置adapter");
							handler.obtainMessage(0).sendToTarget();
							
						}else{
							
						}
					} catch (Exception e) {
						// TODO Auto-generated catch block
						Log.e("this","onclick     " e);
						e.printStackTrace();
					}
					
				};
				
				
			}.start();
		}
		
	}

	public String getURL(HttpResponse response) throws Exception {
		InputStream inputStream = response.getEntity().getContent();
		byte[] by = new byte[1024];
		int len = 0;
		ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
		while ((len = inputStream.read(by)) != -1) {
			arrayOutputStream.write(by, 0, len);

		}
		String rs = new String(arrayOutputStream.toByteArray(), "UTF-8");
		arrayOutputStream.flush();
		arrayOutputStream.close();
		inputStream.close();
		return rs;
	}
	
	
	public void getBitmap1(String path) {
		InputStream in = null;
		BufferedInputStream bin = null;
		HttpURLConnection connection = null;
		DisplayMetrics dm = new DisplayMetrics();
		getWindowManager().getDefaultDisplay().getMetrics(dm);
		int width = dm.widthPixels;//宽度
		int height = dm.heightPixels*84/100 ;//高度
		
		try {
			URL url = new URL(path);
			connection = (HttpURLConnection) url.openConnection();
			connection.setRequestMethod("GET");
			connection.setReadTimeout(5000);
			connection.setDoInput(true);
			
//			in = connection.getInputStream();
//			bin = new BufferedInputStream(in);
//			bm = BitmapFactory.decodeStream(bin);
			
			InputStream input = connection.getInputStream();
			bin = new BufferedInputStream(input);
			BitmapDrawable imageDraw = new BitmapDrawable(bin);
			Bitmap bitmap = imageDraw.getBitmap();
			bitmap = ThumbnailUtils.extractThumbnail(bitmap, width/3, height/4);
			Log.v("this", "成功出--制造bitmap----");
			bitmaps.add(bitmap);

		} catch (Exception e) {
			e.printStackTrace();
			Log.e("this", "制造bitmap失败----");
		} 
		finally {
			try {
				if (in != null) {
					in.close();
					bin.close();
				}

				connection.disconnect();

			} catch (Exception e) {
			}
//			return bm;

		}

	}

	public void getBitmap(String path) {
		Bitmap bm = null;
		InputStream in = null;
		BufferedInputStream bin = null;
		HttpURLConnection connection = null;

		try {
			URL url = new URL(path);
			connection = (HttpURLConnection) url.openConnection();
			connection.setRequestMethod("GET");
			connection.setReadTimeout(5000);
			connection.setDoInput(true);
			
			in = connection.getInputStream();
			bin = new BufferedInputStream(in);
			bm = BitmapFactory.decodeStream(bin);
			bitmaps.add(bm);
			Log.v("this", "成功出--制造bitmap----");
		} catch (Exception e) {
			e.printStackTrace();
//			bitmaps.add(bitmaps.get(1));
			Log.e("this", "制造bitmap失败----" e);
		} 
		try {
			in.close();
			bin.close();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		connection.disconnect();
			
	}
	
}