An_多線程loadmore

多線程下載apk在網(wǎng)上有很多的例子，我們可以找到很多，在這里我提供一種例子來實現(xiàn)更新版本apk
首先添加網(wǎng)絡(luò)權(quán)限；
下面寫個net包
新建FileDownloadThread類

package com.example.zhoukao_zidingyiyuan_moredownload.net;

import android.util.Log;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.net.URL;
import java.net.URLConnection;

/**
 * 作者：author
 * 時間 ：
 * 說明：
 */

public class FileDownloadThread extends Thread {
    private static final String TAG = FileDownloadThread.class.getSimpleName();
    /** 當(dāng)前下載是否完成 */
    private boolean isCompleted = false;
    /** 當(dāng)前下載文件長度 */
    private int downloadLength = 0;
    /** 文件保存路徑 */
    private File file;
    /** 文件下載路徑 */
    private URL downloadUrl;
    /** 當(dāng)前下載線程ID */
    private int threadId;
    /** 線程下載數(shù)據(jù)長度 */
    private int blockSize;

    /**
     *
     * @param url:文件下載地址
     * @param file:文件保存路徑
     * @param blocksize:下載數(shù)據(jù)長度
     * @param threadId:線程ID
     */
    public FileDownloadThread(URL downloadUrl, File file, int blocksize,
                              int threadId) {
        this.downloadUrl = downloadUrl;
        this.file = file;
        this.threadId = threadId;
        this.blockSize = blocksize;
    }

    @Override
    public void run() {
        BufferedInputStream bis = null;
        RandomAccessFile raf = null;
        try {
            URLConnection conn = downloadUrl.openConnection();
            conn.setAllowUserInteraction(true);
            int startPos = blockSize * (threadId - 1);//開始位置
            int endPos = blockSize * threadId - 1;//結(jié)束位置
            //設(shè)置當(dāng)前線程下載的起點、終點
            conn.setRequestProperty("Range", "bytes=" + startPos + "-" + endPos);
            System.out.println(Thread.currentThread().getName() + "  bytes="
                    + startPos + "-" + endPos);

            byte[] buffer = new byte[1024];
            bis = new BufferedInputStream(conn.getInputStream());

            raf = new RandomAccessFile(file, "rwd");
            raf.seek(startPos);
            int len;
            while ((len = bis.read(buffer, 0, 1024)) != -1) {
                raf.write(buffer, 0, len);
                downloadLength += len;
            }
            isCompleted = true;
            Log.d(TAG, "current thread task has finished,all size:"
                    + downloadLength);

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (bis != null) {
                try {
                    bis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (raf != null) {
                try {
                    raf.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    /**
     * 線程文件是否下載完畢
     */
    public boolean isCompleted() {
        return isCompleted;
    }
    /**
     * 線程下載文件長度
     */
    public int getDownloadLength() {
        return downloadLength;
    }
}

通過接口回調(diào)在Activity里面點擊條目跳轉(zhuǎn)到另一個Activity(跳轉(zhuǎn)時intent傳 視頻的網(wǎng)址接口)

 RvAdapter rvAdapter = new RvAdapter(MoreActivity.this, list);
        mRv.setAdapter(rvAdapter);
        rvAdapter.setOnItemClickListener(new RvAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(View view, int positon) {
                String urlmovie = list.get(positon).getVedio_url();
                Toast.makeText(MoreActivity.this,urlmovie,Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(MoreActivity.this,DownloadActivity.class);
                intent.putExtra("urlmovie",urlmovie);
                Log.i("------", "onItemClick: "+urlmovie);
                startActivity(intent);

            }
        });

DownloadActivity

package com.example.zhoukao_zidingyiyuan_moredownload;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.MediaController;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.VideoView;

import com.example.zhoukao_zidingyiyuan_moredownload.net.FileDownloadThread;

import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import butterknife.BindView;
import butterknife.ButterKnife;

public class DownloadActivity extends AppCompatActivity implements View.OnClickListener{

    private static final String TAG = DownloadActivity.class.getSimpleName();
    @BindView(R.id.download_btn)
    Button downloadBtn;
    @BindView(R.id.download_progress)
    ProgressBar downloadProgress;
    @BindView(R.id.download_message)
    TextView downloadMessage;
    @BindView(R.id.other_vdv)
    VideoView otherVdv;
    private TextView mMessageView;
    /**
     * 顯示下載進(jìn)度ProgressBar
     */
    private ProgressBar mProgressbar;
    private String name;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_download);
        ButterKnife.bind(this);
        Intent intent = getIntent();
        //傳值
        name = intent.getStringExtra("urlmovie");
        Log.i("name***", "onCreate: "+name);
        findViewById(R.id.download_btn).setOnClickListener(this);
        mMessageView = (TextView) findViewById(R.id.download_message);
        mProgressbar = (ProgressBar) findViewById(R.id.download_progress);

    }

    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.download_btn) {
            Toast.makeText(DownloadActivity.this,"onclick",Toast.LENGTH_SHORT).show();
            doDownload();
        }
    }
    /**
     * 使用Handler更新UI界面信息
     */
    @SuppressLint("HandlerLeak")
    Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {

            mProgressbar.setProgress(msg.getData().getInt("size"));

            float temp = (float) mProgressbar.getProgress()
                    / (float) mProgressbar.getMax();

            int progress = (int) (temp * 100);
            if (progress == 100) {
                Toast.makeText(DownloadActivity.this, "下載完成！", Toast.LENGTH_LONG).show();
                MediaController media= new MediaController(DownloadActivity.this);
                Uri uri = Uri.parse(name);
                otherVdv.setVideoURI(uri);
                otherVdv.setMediaController(media);
                otherVdv.start();




            }
            mMessageView.setText("下載進(jìn)度:" + progress + " %");

        }
    };
    /**
     * 下載準(zhǔn)備工作，獲取SD卡路徑、開啟線程
     */
    private void doDownload() {
        // 獲取SD卡路徑
        String path = Environment.getExternalStorageDirectory()
                + "/amosdownload/";
        File file = new File(path);
        // 如果SD卡目錄不存在創(chuàng)建
        if (!file.exists()) {
            file.mkdir();
        }
        // 設(shè)置progressBar初始化
        mProgressbar.setProgress(0);

        // 簡單起見，我先把URL和文件名稱寫死，其實這些都可以通過HttpHeader獲取到
        String downloadUrl = name;
        String fileName = "shipin.mp4";
        int threadNum = 5;
        String filepath = path + fileName;
        Log.d(TAG, "download file  path:" + filepath);
        downloadTask task = new downloadTask(downloadUrl, threadNum, filepath);
        task.start();
    }
    /**
     * 多線程文件下載
     *
     * @author yangxiaolong
     * @2014-8-7
     */
    class downloadTask extends Thread {
        private String downloadUrl;// 下載鏈接地址
        private int threadNum;// 開啟的線程數(shù)
        private String filePath;// 保存文件路徑地址
        private int blockSize;// 每一個線程的下載量

        public downloadTask(String downloadUrl, int threadNum, String fileptah) {
            this.downloadUrl = downloadUrl;
            this.threadNum = threadNum;
            this.filePath = fileptah;
        }

        @Override
        public void run() {

            FileDownloadThread[] threads = new FileDownloadThread[threadNum];
            try {
                URL url = new URL(downloadUrl);
                Log.d(TAG, "download file http path:" + downloadUrl);
                URLConnection conn = url.openConnection();
                // 讀取下載文件總大小
                int fileSize = conn.getContentLength();
                if (fileSize <= 0) {
                    System.out.println("讀取文件失敗");
                    return;
                }
                // 設(shè)置ProgressBar最大的長度為文件Size
                mProgressbar.setMax(fileSize);

                // 計算每條線程下載的數(shù)據(jù)長度
                blockSize = (fileSize % threadNum) == 0 ? fileSize / threadNum
                        : fileSize / threadNum + 1;

                Log.d(TAG, "fileSize:" + fileSize + "  blockSize:" + blockSize);

                File file = new File(filePath);
                for (int i = 0; i < threads.length; i++) {
                    // 啟動線程，分別下載每個線程需要下載的部分
                    threads[i] = new FileDownloadThread(url, file, blockSize,
                            (i + 1));
                    threads[i].setName("Thread:" + i);
                    threads[i].start();
                }

                boolean isfinished = false;
                int downloadedAllSize = 0;
                while (!isfinished) {
                    isfinished = true;
                    // 當(dāng)前所有線程下載總量
                    downloadedAllSize = 0;
                    for (int i = 0; i < threads.length; i++) {
                        downloadedAllSize += threads[i].getDownloadLength();
                        if (!threads[i].isCompleted()) {
                            isfinished = false;
                        }
                    }
                    // 通知handler去更新視圖組件
                    Message msg = new Message();
                    msg.getData().putInt("size", downloadedAllSize);
                    mHandler.sendMessage(msg);
                    // Log.d(TAG, "current downloadSize:" + downloadedAllSize);
                    Thread.sleep(1000);// 休息1秒后再讀取下載進(jìn)度
                }
                Log.d(TAG, " all of downloadSize:" + downloadedAllSize);

            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

        }
    }
}

最后給出DownloadActivity 的布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.zhoukao_zidingyiyuan_moredownload.DownloadActivity">
    <Button
        android:id="@+id/download_btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="80dp"
        android:text="Download"
        android:visibility="visible" />

    <ProgressBar
        android:id="@+id/download_progress"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:progressDrawable="@drawable/progressbar_horizontal_1"
        android:layout_marginTop="20dp"
        android:indeterminate="false"
        android:indeterminateOnly="false"
        android:maxHeight="20dp"
        android:minHeight="20dp"
        android:paddingLeft="8dp"
        android:paddingRight="8dp"
        android:progress="0"
        android:secondaryProgress="0" />

    <TextView
        android:id="@+id/download_message"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal|center_vertical"
        android:text="下載進(jìn)度:0%" />
    <VideoView
        android:id="@+id/other_vdv"
        android:layout_width="match_parent"
        android:layout_height="300dp" />

</LinearLayout>

drawable里面的布局進(jìn)度條：
progressbar_horizontal_1.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <!-- background -->
    <item
        android:id="@android:id/background"
        android:drawable="@drawable/progress_patch_galy">
    </item>
    <!-- progress -->
    <item android:id="@android:id/progress">
        <clip>
            <nine-patch android:src="@drawable/progress_patch_green" />
        </clip>
    </item>
    <!-- second progress -->

    <item android:id="@android:id/secondaryProgress">
        <clip>
            <nine-patch android:src="@drawable/progresspatch_blue" />
        </clip>
    </item>

</layer-list>

RetrofitUtils

    @Streaming
    @POST("{fileName}")
    Call<ResponseBody> downloadFile(@Path("fileName") String fileName, @Header("Range") String range);
    @Streaming
    @POST("{fileName}")
    Call<ResponseBody> getFileLength(@Path("fileName") String fileName);
最后編輯于 ：
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