package com.ljd.retrofit.progress;

/**
 * Created by ljd on 3/29/16.
 */
public interface ProgressListener {
 /**
  * @param progress  已经下载或上传字节数
  * @param total  总字节数
  * @param done   是否完成
  */
 void onProgress(long progress, long total, boolean done);
}

package com.ljd.retrofit.progress;
import java.io.IOException;

import okhttp3.MediaType;
import okhttp3.ResponseBody;
import okio.Buffer;
import okio.BufferedSource;
import okio.ForwardingSource;
import okio.Okio;
import okio.Source;

/**
 * Created by ljd on 3/29/16.
 */
public class ProgressResponseBody extends ResponseBody {
 private final ResponseBody responseBody;
 private final ProgressListener progressListener;
 private BufferedSource bufferedSource;

 public ProgressResponseBody(ResponseBody responseBody, ProgressListener progressListener) {
  this.responseBody = responseBody;
  this.progressListener = progressListener;
 }

 @Override
 public MediaType contentType() {
  return responseBody.contentType();
 }


 @Override
 public long contentLength() {
  return responseBody.contentLength();
 }

 @Override
 public BufferedSource source() {
  if (bufferedSource == null) {
   bufferedSource = Okio.buffer(source(responseBody.source()));
  }
  return bufferedSource;
 }

 private Source source(Source source) {
  return new ForwardingSource(source) {
   long totalBytesRead = 0L;

   @Override
   public long read(Buffer sink, long byteCount) throws IOException {
    long bytesRead = super.read(sink, byteCount);
    totalBytesRead += bytesRead != -1 ? bytesRead : 0;
    progressListener.onProgress(totalBytesRead, responseBody.contentLength(), bytesRead == -1);
    return bytesRead;
   }
  };
 }
}

package com.ljd.retrofit.progress;

import android.util.Log;

import java.io.IOException;

import okhttp3.Interceptor;
import okhttp3.OkHttpClient;

/**
 * Created by ljd on 4/12/16.
 */
public class ProgressHelper {

 private static ProgressBean progressBean = new ProgressBean();
 private static ProgressHandler mProgressHandler;

 public static OkHttpClient.Builder addProgress(OkHttpClient.Builder builder){

  if (builder == null){
   builder = new OkHttpClient.Builder();
  }

  final ProgressListener progressListener = new ProgressListener() {
   //该方法在子线程中运行
   @Override
   public void onProgress(long progress, long total, boolean done) {
    Log.d("progress:",String.format("%d%% done\n",(100 * progress) / total));
    if (mProgressHandler == null){
     return;
    }

    progressBean.setBytesRead(progress);
    progressBean.setContentLength(total);
    progressBean.setDone(done);
    mProgressHandler.sendMessage(progressBean);

   }
  };

  //添加拦截器，自定义ResponseBody，添加下载进度
  builder.networkInterceptors().add(new Interceptor() {
   @Override
   public okhttp3.Response intercept(Chain chain) throws IOException {
    okhttp3.Response originalResponse = chain.proceed(chain.request());
    return originalResponse.newBuilder().body(
      new ProgressResponseBody(originalResponse.body(), progressListener))
      .build();

   }
  });

  return builder;
 }

 public static void setProgressHandler(ProgressHandler progressHandler){
  mProgressHandler = progressHandler;
 }
}

package com.example.ljd.retrofit.pojo;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by ljd on 3/29/16.
 */
public class RetrofitBean {

 private Integer total_count;
 private Boolean incompleteResults;
 private List<Item> items = new ArrayList<Item>();

 /**
  *
  * @return
  *  The totalCount
  */
 public Integer getTotalCount() {
  return total_count;
 }

 /**
  *
  * @param totalCount
  *  The total_count
  */
 public void setTotalCount(Integer totalCount) {
  this.total_count = totalCount;
 }

 /**
  *
  * @return
  *  The incompleteResults
  */
 public Boolean getIncompleteResults() {
  return incompleteResults;
 }

 /**
  *
  * @param incompleteResults
  *  The incomplete_results
  */
 public void setIncompleteResults(Boolean incompleteResults) {
  this.incompleteResults = incompleteResults;
 }

 /**
  *
  * @return
  *  The items
  */
 public List<Item> getItems() {
  return items;
 }
}

package com.ljd.retrofit.progress;

import android.os.Handler;
import android.os.Looper;
import android.os.Message;

/**
 * Created by ljd on 4/12/16.
 */
public abstract class ProgressHandler {

 protected abstract void sendMessage(ProgressBean progressBean);

 protected abstract void handleMessage(Message message);

 protected abstract void onProgress(long progress, long total, boolean done);

 protected static class ResponseHandler extends Handler{

  private ProgressHandler mProgressHandler;
  public ResponseHandler(ProgressHandler mProgressHandler, Looper looper) {
   super(looper);
   this.mProgressHandler = mProgressHandler;
  }

  @Override
  public void handleMessage(Message msg) {
   mProgressHandler.handleMessage(msg);
  }
 }

}

package com.ljd.retrofit.progress;


import android.os.Looper;
import android.os.Message;

/**
 * Created by ljd on 4/12/16.
 */
public abstract class DownloadProgressHandler extends ProgressHandler{

 private static final int DOWNLOAD_PROGRESS = 1;
 protected ResponseHandler mHandler = new ResponseHandler(this, Looper.getMainLooper());

 @Override
 protected void sendMessage(ProgressBean progressBean) {
  mHandler.obtainMessage(DOWNLOAD_PROGRESS,progressBean).sendToTarget();

 }

 @Override
 protected void handleMessage(Message message){
  switch (message.what){
   case DOWNLOAD_PROGRESS:
    ProgressBean progressBean = (ProgressBean)message.obj;
    onProgress(progressBean.getBytesRead(),progressBean.getContentLength(),progressBean.isDone());
  }
 }
}

package com.example.ljd.retrofit.download;

import android.app.ProgressDialog;
import android.os.Environment;
import android.os.Looper;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;

import com.example.ljd.retrofit.R;
import com.ljd.retrofit.progress.DownloadProgressHandler;
import com.ljd.retrofit.progress.ProgressHelper;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import butterknife.ButterKnife;
import butterknife.OnClick;
import okhttp3.OkHttpClient;
import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.adapter.rxjava.RxJavaCallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;

public class DownloadActivity extends AppCompatActivity {


 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_download);
  ButterKnife.bind(this);

 }

 @Override
 protected void onDestroy() {
  ButterKnife.unbind(this);
  super.onDestroy();
 }

 @OnClick(R.id.start_download_btn)
 public void onClickButton(){
  retrofitDownload();
 }

 private void retrofitDownload(){
  //监听下载进度
  final ProgressDialog dialog = new ProgressDialog(this);
  dialog.setProgressNumberFormat(" KB/%2d KB");
  dialog.setTitle("下载");
  dialog.setMessage("正在下载，请稍后...");
  dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
  dialog.setCancelable(false);
  dialog.show();

  Retrofit.Builder retrofitBuilder = new Retrofit.Builder()
    .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
    .addConverterFactory(GsonConverterFactory.create())
    .baseUrl("http://msoftdl.360.cn");
  OkHttpClient.Builder builder = ProgressHelper.addProgress(null);
  DownloadApi retrofit = retrofitBuilder
    .client(builder.build())
    .build().create(DownloadApi.class);

  ProgressHelper.setProgressHandler(new DownloadProgressHandler() {
   @Override
   protected void onProgress(long bytesRead, long contentLength, boolean done) {
    Log.e("是否在主线程中运行", String.valueOf(Looper.getMainLooper() == Looper.myLooper()));
    Log.e("onProgress",String.format("%d%% done\n",(100 * bytesRead) / contentLength));
    Log.e("done","--->" + String.valueOf(done));
    dialog.setMax((int) (contentLength/1024));
    dialog.setProgress((int) (bytesRead/1024));

    if(done){
     dialog.dismiss();
    }
   }
  });

  Call<ResponseBody> call = retrofit.retrofitDownload();
  call.enqueue(new Callback<ResponseBody>() {
   @Override
   public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
    try {
     InputStream is = response.body().byteStream();
     File file = new File(Environment.getExternalStorageDirectory(), "12345.apk");
     FileOutputStream fos = new FileOutputStream(file);
     BufferedInputStream bis = new BufferedInputStream(is);
     byte[] buffer = new byte[1024];
     int len;
     while ((len = bis.read(buffer)) != -1) {
      fos.write(buffer, 0, len);
      fos.flush();
     }
     fos.close();
     bis.close();
     is.close();
    } catch (IOException e) {
     e.printStackTrace();
    }
   }

   @Override
   public void onFailure(Call<ResponseBody> call, Throwable t) {

   }
  });

 }
}