[Android开发] 使用okhttp下载文件(带监听)

DownloadManager.java

package com.minstone.mdoctor.tool.net;import android.os.Handler;import android.os.Looper;import com.minstone.util.LogUtil;import com.squareup.okhttp.Call;import com.squareup.okhttp.Callback;import com.squareup.okhttp.OkHttpClient;import com.squareup.okhttp.Request;import com.squareup.okhttp.Response;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import javax.net.ssl.SSLContext;import javax.net.ssl.TrustManager;import static com.minstone.util.FileAccessor.getFileName;/** * Created by LITP on 2016/9/26. */public class DownloadManager {    public DownloadManager() {        mDelivery = new Handler(Looper.getMainLooper());    }    private Handler mDelivery;     //主线程返回    private Call downCall;         //下载的call    private static OkHttpClient mOkHttpClient;    private static DownloadManager mInstance;    //单例    public static DownloadManager getInstance() {        if (mInstance == null) {            synchronized (OkHttpManager.class) {                if (mInstance == null) {                    mInstance = new DownloadManager();                }            }        }        return mInstance;    }    //synchronized修饰的静态方法锁定的是这个类的所有对象,保证在同一时刻最多只有一个线程执行该段代码    public synchronized  OkHttpClient getOkHttpClient() {        if (null == mOkHttpClient) {            try {                mOkHttpClient = newOkHttpClient();            } catch (Exception e) {                e.printStackTrace();            }        }        return mOkHttpClient;    }    /**     * 创建okhttp     *     * @return     * @throws Exception     */    private OkHttpClient newOkHttpClient() throws Exception {        //创建okHttpClient对象        OkHttpClient mOkHttpClient = new OkHttpClient();        TrustManager tm = new OkHttpManager.myTrustManager();        SSLContext sslContext = SSLContext.getInstance("TLS");        sslContext.init(null, new TrustManager[]{tm}, null);        mOkHttpClient.setSslSocketFactory(sslContext.getSocketFactory());        return mOkHttpClient;    }    /**     * 异步下载文件     *     * @param url         文件的下载地址     * @param destFileDir 本地文件存储的文件夹     * @param callback     */    private void okHttpDownload(final String url, final String destFileDir, final ResultCallback callback) {        final Request request = new Request.Builder()                .url(url)                .build();        downCall = getOkHttpClient().newCall(request);        downCall.enqueue(new Callback() {            @Override            public void onFailure(final Request request, final IOException e) {                sendFailedStringCallback(request, e, callback);            }            @Override            public void onResponse(Response response) {                InputStream is = null;                byte[] buf = new byte[2048];                int len = 0;                FileOutputStream fos = null;                try {                    double current = 0;                    double total = response.body().contentLength();                    is = response.body().byteStream();                    File file = new File(destFileDir, getFileName(url));                    fos = new FileOutputStream(file);                    while ((len = is.read(buf)) != -1) {                        current += len;                        fos.write(buf, 0, len);                        LogUtil.w("download current------>" + current);                        sendProgressCallBack(total, current, callback);                    }                    fos.flush();                    //如果下载文件成功，第一个参数为文件的绝对路径                    sendSuccessResultCallback(file.getAbsolutePath(), callback);                } catch (IOException e) {                    sendFailedStringCallback(response.request(), e, callback);                } finally {                    try {                        if (is != null) is.close();                    } catch (IOException e) {                        e.printStackTrace();                    }                    try {                        if (fos != null) fos.close();                    } catch (IOException e) {                        e.printStackTrace();                    }                }            }        });    }    //下载失败ui线程回调    private void sendFailedStringCallback(final Request request, final Exception e, final ResultCallback callback) {        mDelivery.post(new Runnable() {            @Override            public void run() {                if (callback != null)                    callback.onError(request, e);            }        });    }    //下载成功ui线程回调    private void sendSuccessResultCallback(final Object object, final ResultCallback callback) {        mDelivery.post(new Runnable() {            @Override            public void run() {                if (callback != null) {                    callback.onResponse(object);                }            }        });    }    //下载回调接口    public static abstract class ResultCallback<T> {        //下载错误        public abstract void onError(Request request, Exception e);        //下载成功        public abstract void onResponse(T response);        //下载进度        public abstract void onProgress(double total, double current);    }    /**     * 进度信息ui线程回调     *     * @param total    总计大小     * @param current  当前进度     * @param callBack     * @param <T>     */    private <T> void sendProgressCallBack(final double total, final double current, final ResultCallback<T> callBack) {        mDelivery.post(new Runnable() {            @Override            public void run() {                if (callBack != null) {                    callBack.onProgress(total, current);                }            }        });    }    /*  下面为对外开放接口 */    /**     * 下载文件     *     * @param url 文件链接     * @param destDir 下载保存地址     * @param callback 回调     */    public static void downloadFile(String url, String destDir, ResultCallback callback) {        getInstance().okHttpDownload(url, destDir, callback);    }    /**     * 取消下载     */    public static void cancleDown(){        getInstance().downCall.cancel();    }}

使用:

    private void startDown(){        String apkUrl = "apk下载的链接";        String fileUrl = Environment.getExternalStorageDirectory().getAbsolutePath();        DownloadManager.downloadFile(apkUrl,fileUrl,new DownloadCallBack());    }    //监听类    class DownloadCallBack extends DownloadManager.ResultCallback {        @Override        public void onError(Request request, Exception e) {            //下载失败返回        }        @Override        public void onResponse(Object response) {            //下载成功返回        }        @Override        public void onProgress(double total, double current) {            //进度返回        }    }