Android Asynchronous-Http-Client断点续传

来源：互联网发布：安道麦销售网络编辑：程序博客网时间：2024/06/04 18:46

本文基于AsyncHttpClient实现了断点续传的功能（对于AsyncHttpClient导入及基本用法请参照我的上一篇文章）

1、先看下功能UI界面(下载：实现对文件的请求；取消：取消当前下载；删除：取消当前下载，删除下载的文件，将进度条重置)

注意：您应该验证，当你在下载过程中，取消了下载后，再次点击下载时是否从上次下载结束的地方开始请求。

2、UI布局文件

<?xml version="1.0" encoding="utf-8"?><RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.analysys.asynchttpclientdemothree.activities.MainActivity"    android:padding="5dp">    <LinearLayout        android:id="@+id/linearLayoutId"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal">        <Button            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="wrap_content"            android:text="下载"            android:id="@+id/getButtonId"            android:layout_alignParentTop="true"            android:layout_centerHorizontal="true"/>        <Button            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="wrap_content"            android:text="取消"            android:id="@+id/cancelButtonId"            android:layout_alignParentTop="true"            android:layout_centerHorizontal="true"/>        <Button            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="wrap_content"            android:text="删除"            android:id="@+id/deleteButtonId"            android:layout_alignParentTop="true"            android:layout_centerHorizontal="true"/>    </LinearLayout>    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="当前进度"        android:layout_marginTop="10dp"        android:id="@+id/textViewId"        android:layout_below="@+id/linearLayoutId"        android:layout_alignParentRight="true"/>    <ProgressBar        android:id="@+id/progressBarId"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginTop="10dp"        style="@style/Base.Widget.AppCompat.ProgressBar.Horizontal"        android:layout_below="@id/linearLayoutId"        android:layout_toLeftOf="@id/textViewId"        android:layout_alignParentLeft="true"/></RelativeLayout>

三、activity类文件

package com.analysys.asynchttpclientdemothree.activities;import android.media.MediaPlayer;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.ProgressBar;import android.widget.TextView;import android.widget.Toast;import com.analysys.asynchttpclientdemothree.R;import com.analysys.asynchttpclientdemothree.http_request_engine.HttpRequestEngine;import java.io.File;import java.io.IOException;public class MainActivity extends AppCompatActivity implements View.OnClickListener{    private Button get;    private Button cancel;    private Button deleteButton;    private TextView textView;    private ProgressBar progressBar;    //下面的地址是mp3文件地址，可能会失效；如果失效，您自己替换啊    private String url = "http://wzg.free.fr/Joyeux-anniversaire.mp3";    private MediaPlayer mediaPlayer;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }    private void initView(){        get = (Button)findViewById(R.id.getButtonId);        get.setOnClickListener(this);        cancel = (Button)findViewById(R.id.cancelButtonId);        cancel.setOnClickListener(this);        deleteButton = (Button)findViewById(R.id.deleteButtonId);        deleteButton.setOnClickListener(this);        textView = (TextView)findViewById(R.id.textViewId);        progressBar = (ProgressBar)findViewById(R.id.progressBarId);    }    private void get(){        File filesDir = this.getFilesDir();        filesDir = new File(filesDir.getAbsoluteFile() + "/App");        filesDir.mkdirs();        HttpRequestEngine.get(url, new MainHandle(), filesDir.getAbsolutePath() + "/my.mp3");    }    private void cancel(){        //先停止网络请求        HttpRequestEngine.cancelGet();    }    private void delete(){        //先停止网络请求        HttpRequestEngine.cancelGet();        //再处理本地UI        progressBar.setProgress(0);        if (mediaPlayer != null){            mediaPlayer.stop();            mediaPlayer.release();            mediaPlayer = null;        }        //再删除文件        File filesDir = MainActivity.this.getFilesDir();        File file = new File(filesDir.getAbsoluteFile() + "/App/my.mp3");        if (file.exists()){            file.delete();        }    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.getButtonId:                get();                break;            case R.id.cancelButtonId:                cancel();                break;            case R.id.deleteButtonId:                delete();                break;        }    }    public class MainHandle extends Handler{        public void handleMessage(Message msg) {            //处理下载进度的回调            if (msg.what == HttpRequestEngine.progressNotificationId){                progressBar.setProgress(msg.arg1);                textView.setText(msg.arg1 + "%");            }            //处理下载完成的回调            if (msg.what == HttpRequestEngine.successNotificationId){                File filesDir = MainActivity.this.getFilesDir();                File file = new File(filesDir.getAbsoluteFile() + "/App/my.mp3");                if (file.exists()){                    Log.d("MQL", "大小: " + file.length());                    MainActivity.this.installMp3(file);                }            }            //处理下载失败的回调            if (msg.what == HttpRequestEngine.failureNotificationId){                Toast toast = Toast.makeText(MainActivity.this, (String)msg.obj, Toast.LENGTH_LONG);                toast.show();            }        }    }    //播放    private void installMp3(File file) {

if(mediaPlayer!=null && mediaPlayer.isPlaying()){

return;

}        mediaPlayer = new MediaPlayer();        try {            mediaPlayer.setDataSource(file.getAbsolutePath());            mediaPlayer.prepare();            mediaPlayer.start();        } catch (Exception e) {            e.printStackTrace();        }    }}

四、HttpRequestEngine文件（该文件实现了断点续传的功能，提供对外的请求接口、取消接口）

package com.analysys.asynchttpclientdemothree.http_request_engine;import android.os.Handler;import android.os.Message;import android.util.Log;import java.io.File;import com.loopj.android.http.*;import cz.msebera.android.httpclient.Header;import cz.msebera.android.httpclient.HttpResponse;/** * Created by MQL on 2016/9/27. * 功能：提供网络请求 */public class HttpRequestEngine {    private static AsyncHttpClient client = new AsyncHttpClient();    private static RequestHandle getRequestHandle;  //使用它取消具体某个请求    private static Handler mainHandler;             //回调通知    private static String Tag = "MQL";    private static String targetFilePath;           //目标文件保存路径    private static long fromLength = 0;             //请求前，本地已有的字节大小    public static final int progressNotificationId = 1000;    public static final int successNotificationId = 1001;    public static final int failureNotificationId = 1002;    //不带参数的get请求    public static void get(String url, Handler mainHandler,String targetFilePath ){        //先取消当前活动的请求        cancelGet();        //记录Handler For Callback;记录目标文件保存路径        HttpRequestEngine.mainHandler = mainHandler;        HttpRequestEngine.targetFilePath = targetFilePath;        //发送新的请求        HttpRequestEngine.get(url, new FileAsyncHttpResponseHandler(new File(targetFilePath), true) {            @Override            public void onPreProcessResponse(ResponseHandlerInterface instance, HttpResponse response) {                Log.d("MQL", "onPreProcessResponse");                if (response.getStatusLine().getStatusCode() == 416){//416: request Range Not Satisfiable, 出现这种请求立即取消请求                    if (HttpRequestEngine.mainHandler != null){                        Message msg1 = new Message();                        msg1.what = HttpRequestEngine.progressNotificationId;                        msg1.arg1 = 100;                        HttpRequestEngine.mainHandler.sendMessage(msg1);                        Message msg2 = new Message();                        msg2.what = HttpRequestEngine.successNotificationId;                        HttpRequestEngine.mainHandler.sendMessage(msg2);                    }                    cancelGet();                }else if (response.getStatusLine().getStatusCode() == 403){//Forbidden                    if (HttpRequestEngine.mainHandler != null){                        Message msg = new Message();                        msg.what = HttpRequestEngine.failureNotificationId;                        msg.obj = "Forbidden";                        HttpRequestEngine.mainHandler.sendMessage(msg);                    }                    cancelGet();                }            }            public void onSuccess(int statusCode, Header[] headers, File file){                Log.d("MQL", "onSuccess");                if (statusCode == 206) {                    if (HttpRequestEngine.mainHandler != null){                        Message msg = new Message();                        msg.what = HttpRequestEngine.successNotificationId;                        HttpRequestEngine.mainHandler.sendMessage(msg);                    }                }            }            public void onFailure(int statusCode, Header[] headers, Throwable throwable, File file){                Log.d("MQL", "onFailure: " + throwable.toString());                if (HttpRequestEngine.mainHandler != null){                    Message msg = new Message();                    msg.what = HttpRequestEngine.failureNotificationId;                    msg.obj = throwable.toString();                    HttpRequestEngine.mainHandler.sendMessage(msg);                }            }            public void onProgress(long bytesWritten, long totalSize) {                Log.d("MQL", "" + (bytesWritten + HttpRequestEngine.fromLength)  + ", " + (totalSize + HttpRequestEngine.fromLength));                int progress = (int)((totalSize > 0) ? ((bytesWritten + HttpRequestEngine.fromLength) * 1.0 / (totalSize + HttpRequestEngine.fromLength)) * 100 : -1);                if (HttpRequestEngine.mainHandler != null){                    Message msg = new Message();                    msg.what = HttpRequestEngine.progressNotificationId;                    msg.arg1 = progress;                    HttpRequestEngine.mainHandler.sendMessage(msg);                }            }        } );    }    //不带参数的get请求    private static void get(String url, AsyncHttpResponseHandler responseHandler) {        //获取文件大小        File file = new File(HttpRequestEngine.targetFilePath);        HttpRequestEngine.fromLength = 0;        if (file.exists()){            HttpRequestEngine.fromLength = file.length();        }        //通过设置请求头，使请求可以断点处继续请求        client.addHeader("Range", "bytes=" + HttpRequestEngine.fromLength + "-");        HttpRequestEngine.getRequestHandle = client.get(url, responseHandler);    }    //取消不带参数的get请求    public static void cancelGet(){        if (HttpRequestEngine.getRequestHandle != null){            HttpRequestEngine.getRequestHandle.cancel(true);            HttpRequestEngine.getRequestHandle = null;        }        if (HttpRequestEngine.mainHandler != null){            HttpRequestEngine.mainHandler = null;        }    }}

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