MainActivity.java

package com.qf.day23_service_demo2;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;public class MainActivity extends Activity {
         private String iamgUrl = "https://ss2.baidu.com/6ONYsjip0QIZ8tyhnq/it/u=2507878052,3446525205&fm=58";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    //点击按钮  开启服务下载数据    public void MyLoadClick(View v){        Intent intent = new Intent();        intent.setAction("com.qf.day23_service_demo2.MyLoaderService");        intent.putExtra("imagUrl", iamgUrl);        startService(intent);    }    //点击按钮  停止服务    public void StopServiceClick(View v){        Intent intent = new Intent();        intent.setAction("com.qf.day23_service_demo2.MyLoaderService");        stopService(intent);    }}

MyLoaderService.java

package com.qf.day23_service_demo2;import com.qf.day23_service_demo2.utils.FileUtils;import com.qf.day23_service_demo2.utils.HttpUtils;import android.app.IntentService;import android.app.NotificationManager;import android.app.PendingIntent;import android.app.Service;import android.content.Context;import android.content.Intent;import android.os.IBinder;import android.support.v4.app.NotificationCompat;import android.util.Log;public class MyLoaderService extends IntentService {
         String imagUrl = "";    public MyLoaderService(String name) {        super(name);        // TODO Auto-generated constructor stub    }    public MyLoaderService() {        super("");        // TODO Auto-generated constructor stub    }    // 开启了线程    @Override    protected void onHandleIntent(Intent intent) {        // TODO Auto-generated method stub        imagUrl = intent.getStringExtra("imagUrl");        // 开启下载        // 判断网络状态        if (HttpUtils.isNetWork(MyLoaderService.this)) {            // 开始下载            byte[] buffer = HttpUtils.getData(imagUrl);            // 保存在SD卡            if (FileUtils.isConnSdCard()) {                // 保存到 Sd卡                boolean flag = FileUtils.writeToSdcard(buffer, imagUrl);                if (flag) {                    Log.e("AAA", "下载完成");                    // 发送广播                    sendNotification();                    // 服务自己关闭服务                    stopSelf();                }            } else {                Log.e("AAA", "Sd卡不可用");            }        } else {            Log.e("AAA", "网络异常");        }    }    // 发送广播    public void sendNotification() {        // 要传递的图片名称        imagUrl = imagUrl.substring(imagUrl.lastIndexOf("/") + 1);        NotificationCompat.Builder builder = new NotificationCompat.Builder(                getApplicationContext());        builder.setContentTitle("下载美女图");        builder.setContentText("景甜");        builder.setSmallIcon(R.drawable.ic_launcher);        Intent intent = new Intent(MyLoaderService.this, SecondActivity.class);        intent.putExtra("imagUrl", imagUrl);        PendingIntent pendingIntent = PendingIntent.getActivity(                getApplicationContext(), 100, intent,                PendingIntent.FLAG_ONE_SHOT);        builder.setContentIntent(pendingIntent);        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);        manager.notify(1, builder.build());    }}

SecondActivity.java

package com.qf.day23_service_demo2;import java.io.File;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Environment;import android.widget.ImageView;public class SecondActivity extends Activity {
         private ImageView iv;    @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        setContentView(R.layout.layout);        iv = (ImageView) findViewById(R.id.iv);        String imagUrl = getIntent().getStringExtra("imagUrl");        File file = new File(Environment.                getExternalStoragePublicDirectory(                        Environment.DIRECTORY_DOWNLOADS), imagUrl);        String pathName = file.getAbsolutePath();        Bitmap bp = BitmapFactory.decodeFile(pathName);        iv.setImageBitmap(bp);    }}

FileUtils.java

package com.qf.day23_service_demo2.utils;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import android.os.Environment;public class FileUtils {
         /**     * 判断sdCard是否挂载     * @return     */    public static boolean isConnSdCard(){        if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){            return true;        }        return false;    }    /**     * 将图片的字节数组保存到  sd卡上     * @return     */    public static boolean writeToSdcard(byte[] buffer ,String imagName){        FileOutputStream outputStream =null;        boolean flag = false;        String fileName = imagName.substring(imagName.lastIndexOf("/")+1);        File file = new File(Environment.                getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS),                fileName);        try {            outputStream = new FileOutputStream(file);            outputStream.write(buffer);            flag = true;        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }finally{            if(outputStream!=null){                try {                    outputStream.close();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }        }        return flag;    }}

HttpUtils.java

package com.qf.day23_service_demo2.utils;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import org.apache.http.HttpResponse;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import android.content.Context;import android.net.ConnectivityManager;import android.net.NetworkInfo;public class HttpUtils {
         /**     * 判断是否有网络     * @param context     * @return     */    public static boolean isNetWork(Context context){        //得到网络的管理者        ConnectivityManager manager = (ConnectivityManager)                 context.getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo info = manager.getActiveNetworkInfo();        if(info!=null){            return true;        }else{            return false;        }    }    /**     * 获取数据     * @param path     * @return     */    public static byte[] getData(String path) {        HttpClient httpClient = new DefaultHttpClient();        HttpGet httpGet = new HttpGet(path);        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();        try {            HttpResponse response = httpClient.execute(httpGet);            if (response.getStatusLine().getStatusCode() == 200) {                InputStream inputStream = response.getEntity().getContent();                byte[] buffer = new byte[1024];                int temp = 0;                while ((temp = inputStream.read(buffer)) != -1) {                    outputStream.write(buffer, 0, temp);                    outputStream.flush();                }            }            return outputStream.toByteArray();        } catch (ClientProtocolException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return null;    }}

清单文件