android開發步步為營之67:使用android開源項目android-async-http非同步下載檔案

標籤：android下載   android-async-http   

         android-async-http項目地址 https://github.com/loopj/android-async-http，android-async-http顧名思義是非同步http請求，不過它也支援同步請求的，本文主要使用了android-async-http做非同步請求下載檔案。每當app需要更新新版本的時候，就需要用到下載功能的，經研究android-async-http這個第三方開源項目還是挺好用的，這裡介紹給大家。

        1、下載類DownloadManager.java

package com.figo.study.latin.mgr;import java.io.File;import java.io.IOException;import java.util.HashMap;import org.apache.http.Header;import android.content.Context;import android.net.ConnectivityManager;import android.os.Environment;import com.figo.study.R;import com.android.inputmethod.latin.model.AsyncDownload;import com.figo.study.util.FileUtil;import com.figo.study.util.NetworkUtil;import com.loopj.android.http.AsyncHttpClient;import com.loopj.android.http.FileAsyncHttpResponseHandler;/** * 非同步下載類 * @author figo * */public class DownloadManager {    private boolean mUseWifiOnly = false;    public DownloadManager() {    }    private HashMap<String, AsyncDownload> asyncDownlaods = null;    public void init() {        asyncDownlaods = new HashMap<String, AsyncDownload>();    }    public void download(final Context context, String url, final String md5, String dirPath, String fileName, final DownloadListener callback) {        try {            callback.onStart();            if (!NetworkUtil.isNetworkUseful(context)) {                callback.onError(context.getString(R.string.lbl_network_useless));            }            if (mUseWifiOnly) {                if (NetworkUtil.getNetworkType(context) != ConnectivityManager.TYPE_WIFI) {                    callback.onError(context.getString(R.string.lbl_not_support));                }                return;            }            String sdPath = Environment.getExternalStorageDirectory() + "/";            AsyncHttpClient client =new AsyncHttpClient();            if (!asyncDownlaods.containsKey(url)) {                AsyncDownload asyncDownload = new AsyncDownload();                asyncDownload.setAsyncHttpClient(client);                asyncDownload.setFileName(sdPath + dirPath + fileName);                asyncDownlaods.put(url, asyncDownload);            }else            {                client=asyncDownlaods.get(url).getAsyncHttpClient();            }            File file = new File(sdPath + dirPath, fileName);            try {                FileUtil.createSDDir(dirPath);                file = FileUtil.createSDFile(dirPath + fileName);            } catch (IOException e1) {                if (e1 != null) {                    e1.printStackTrace();                }            }            FileAsyncHttpResponseHandler fileAsyncHttpResponseHandler = new FileAsyncHttpResponseHandler(file) {                @Override                public void onCancel() {                    super.onCancel();                    System.out.print("cancel success!");                }                @Override                public void onProgress(int bytesWritten, int totalSize) {                    super.onProgress(bytesWritten, totalSize);                    int currentProgress = (int) ((bytesWritten * 1.0f / totalSize) * 100);                    callback.onProgress(currentProgress);                }                @Override                public void onStart() {                    super.onStart();                }                @Override                public void onFailure(int arg0, Header[] arg1, Throwable arg2, File arg3) {                    if (arg2 != null) {                        arg2.printStackTrace();                    }                    if (arg2 != null) {                        callback.onError(arg2.getMessage());                    } else {                        callback.onError(context.getString(R.string.lbl_network_error));                    }                }                @Override                public void onSuccess(int arg0, Header[] arg1, File arg2) {                    String md5String = "";                    try {                        md5String = FileUtil.getFileMD5String(arg2);                    } catch (Exception e) {                        if (e != null) {                            e.printStackTrace();                        }                    }//                    if (md5.equals(md5String) == false) {//                        callback.onError(context.getString(R.string.lbl_md5_error));//                    } else {//                        callback.onSuccess();//                    }                    //測試放開                    callback.onSuccess();                }            };            client.setEnableRedirects(true);//允許重複下載            client.get(context, url, fileAsyncHttpResponseHandler);        } catch (Exception e) {            callback.onError(context.getString(R.string.lbl_system_err));        }    }    public void setDownloadWifiOnly(boolean value) {        mUseWifiOnly = value;    }    public void cancelDownload(Context context, String url) {        try {            if (asyncDownlaods != null && asyncDownlaods.containsKey(url)) {                //已經下載的檔案刪除                FileUtil.deleteFile(asyncDownlaods.get(url).getFileName());                //取消當前下載                AsyncHttpClient client = asyncDownlaods.get(url).getAsyncHttpClient();                if (client != null) {                    client.cancelRequests(context, true);                }                //當前key刪除                asyncDownlaods.remove(url);            }        } catch (Exception e) {            if (e != null) {                e.printStackTrace();            }        }    }}

2、下載監聽類DownloadListener.java

public interface DownloadListener {    public void onStart();    public void onError(String errMessage);    public void onSuccess();    public void onProgress(int progress);}

3、檔案管理類FileUtil.java

/** *  */package com.figo.study.util;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import android.os.Environment;/** * @author figo * */public class FileUtil {     //得到當前外部存放裝置的目錄( /SDCARD )      static String SDPATH = Environment.getExternalStorageDirectory() + "/";    /**     * 預設的密碼字串組合，用來將位元組轉換成 16 進位表示的字元,apache校正下載的檔案的正確性用的就是預設的這個組合     */    protected static char hexDigits[] = {            '0',            '1',            '2',            '3',            '4',            '5',            '6',            '7',            '8',            '9',            'a',            'b',            'c',            'd',            'e',            'f' };    protected static MessageDigest messagedigest = null;    static {        try {            messagedigest = MessageDigest.getInstance("MD5");        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        }    }    public static String getFileMD5String(File file) throws IOException {        InputStream fis;        fis = new FileInputStream(file);        byte[] buffer = new byte[1024];        int numRead = 0;        while ((numRead = fis.read(buffer)) > 0) {            messagedigest.update(buffer, 0, numRead);        }        fis.close();        return bufferToHex(messagedigest.digest());    }    private static String bufferToHex(byte bytes[]) {        return bufferToHex(bytes, 0, bytes.length);    }    private static String bufferToHex(byte bytes[], int m, int n) {        StringBuffer stringbuffer = new StringBuffer(2 * n);        int k = m + n;        for (int l = m; l < k; l++) {            appendHexPair(bytes[l], stringbuffer);        }        return stringbuffer.toString();    }    private static void appendHexPair(byte bt, StringBuffer stringbuffer) {        char c0 = hexDigits[(bt & 0xf0) >> 4];// 取位元組中高 4 位的數字轉換        // 為邏輯右移，將符號位一起右移,此處未發現兩種符號有何不同        char c1 = hexDigits[bt & 0xf];// 取位元組中低 4 位的數字轉換        stringbuffer.append(c0);        stringbuffer.append(c1);    }    public static void main(String[] args) throws IOException {        File file = new File("E:/test/crm_account_YYYY_MM_DD.txt");        String md5 = getFileMD5String(file);        System.out.println("md5:" + md5);    }    /**       * 在SD卡上建立檔案       * @param fileName       * @return       * @throws IOException       */    public static File createSDFile(String fileName) throws IOException {        File file = new File(SDPATH + fileName);        if(file.exists())        {            final File to = new File(file.getAbsolutePath() + System.currentTimeMillis());            file.renameTo(to);            to.delete();//            file.delete();        }        file.createNewFile();        return file;    }    /**       * 在SD卡上建立目錄       * @param dirName       * @return       */    public static File createSDDir(String dirName) {        File dir = new File(SDPATH + dirName);        if(!dir.exists())        {           dir.mkdirs();        }        return dir;    }    /**       * 判斷SD卡上的檔案夾是否存在       * @param fileName       * @return       */    public boolean isFileExist(String fileName) {        File file = new File(SDPATH + fileName);        return file.exists();    }        /**       * 刪除檔案       * @param fileName       * @return       */    public static void deleteFile(String fileName) {        try {            File file = new File(fileName);            if(file.exists())            {                file.delete();            }        } catch (Exception e) {            if(e!=null)            {                e.printStackTrace();            }        }          }}

4、網路管理類NetworkUtil.java

public class NetworkUtil {    public static int getNetworkType(Context mContext) {        try {            final ConnectivityManager connectivityManager = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);            final NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();            return networkInfo.getType();        } catch (Exception e) {            return ConnectivityManager.TYPE_WIFI;        }    }        public static boolean isNetworkUseful(Context mContext)    {        final ConnectivityManager connectivityManager = (ConnectivityManager) mContext                  .getSystemService(Context.CONNECTIVITY_SERVICE);          final NetworkInfo mobNetInfoActivity = connectivityManager                  .getActiveNetworkInfo();          if (mobNetInfoActivity == null || !mobNetInfoActivity.isAvailable()) {              return false;          }else        {            return true;        }    }}

5、測試TestDownloadActivity.java

/** *  */package com.figo.study.activity;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import com.figo.study.R;import com.android.inputmethod.latin.mgr.DownloadListener;import com.android.inputmethod.latin.view.HorizontalProgressBarWithNumber;import com.loopj.android.http.AsyncHttpClient;import com.loopj.android.http.FileAsyncHttpResponseHandler;/** * @author avazu * */public class TestDownloadActivity extends Activity {    private HorizontalProgressBarWithNumber mProgressBar, mProgressBar1;    private Button btnDownload, btnCancel, btn_pause_continue, btnDownload1, btnCancel1;    AsyncHttpClient client = new AsyncHttpClient();    FileAsyncHttpResponseHandler fileAsyncHttpResponseHandler = null;    @Override    protected void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_download_test);        initView();    }    private void initView() {        mProgressBar = (HorizontalProgressBarWithNumber) findViewById(R.id.id_progressbar);        mProgressBar1 = (HorizontalProgressBarWithNumber) findViewById(R.id.id_progressbar1);        //        btn_pause_continue = (Button) findViewById(R.id.btn_pause_continue);        //        btn_pause_continue.setOnClickListener(new OnClickListener() {        //        //            @Override        //            public void onClick(View v) {        //                // TODO Auto-generated method stub        //                fileAsyncHttpResponseHandler.sendRetryMessage(0);        //            }        //        });        final String url = "http://dl.wandoujia.com/files/phoenix/latest/wandoujia-wandoujia_web.apk?timestamp=1409388568830";        final String md5 = "";        final String dirPath = "study/download/";        final String fileName = "豌豆莢.apk";        btnDownload = (Button) findViewById(R.id.btn_download);        try {            btnDownload.setOnClickListener(new OnClickListener() {                @Override                public void onClick(View v) {                                     BaseSkinApplication.shared().getDm().setDownloadWifiOnly(false);                    BaseSkinApplication.shared().getDm().download(TestDownloadActivity.this, url, md5, dirPath, fileName, new DownloadListener() {                        @Override                        public void onStart() {                            btnDownload.setVisibility(View.GONE);                            btnCancel.setVisibility(View.VISIBLE);                        }                        @Override                        public void onError(String errMessage) {                        }                        @Override                        public void onSuccess() {                        }                        @Override                        public void onProgress(int progress) {                            mProgressBar.setProgress(progress);                        }                    });                }            });        } catch (Exception e) {            e.printStackTrace();        }        final String url1 = "http://msoftdl.360.cn/mobilesafe/shouji360/360safesis/360MobileSafe.apk";        final String md51 = "";        final String dirPath1 = "study/download/";        final String fileName1 = "360.apk";        btnDownload1 = (Button) findViewById(R.id.btn_download1);        try {            btnDownload1.setOnClickListener(new OnClickListener() {                @Override                public void onClick(View v) {                                  BaseSkinApplication.shared().getDm().setDownloadWifiOnly(false);                    BaseSkinApplication.shared().getDm().download(TestDownloadActivity.this, url1, md51, dirPath1, fileName1, new DownloadListener() {                        @Override                        public void onStart() {                            btnDownload1.setVisibility(View.GONE);                            btnCancel1.setVisibility(View.VISIBLE);                        }                        @Override                        public void onError(String errMessage) {                        }                        @Override                        public void onSuccess() {                        }                        @Override                        public void onProgress(int progress) {                            mProgressBar1.setProgress(progress);                        }                    });                }            });        } catch (Exception e) {            e.printStackTrace();        }        btnCancel = (Button) findViewById(R.id.btn_cancel);        btnCancel.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                BaseSkinApplication.shared().getDm().cancelDownload(TestDownloadActivity.this, url);                btnDownload.setVisibility(View.VISIBLE);                btnCancel.setVisibility(View.GONE);            }        });        btnCancel1 = (Button) findViewById(R.id.btn_cancel1);        btnCancel1.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                BaseSkinApplication.shared().getDm().cancelDownload(TestDownloadActivity.this, url1);                btnDownload1.setVisibility(View.VISIBLE);                btnCancel1.setVisibility(View.GONE);            }        });    }}

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android開發步步為營之67:使用android開源項目android-async-http非同步下載檔案