Android 中 Service+Notification 断点续传下载

转载请注明出处：http://blog.csdn.net/linglongxin24/article/details/53874148
本文出自【DylanAndroid的博客】

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#Android中Service+Notification断点续传下载

在Android开发中，咱们常常会用到例如版本更新这种的文件下载，那么如何用service+notification去作一个支持断点续传的
文件下载呢？效果图以下

效果图

#一.在启动Activity中启动Service

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Intent intent = new Intent(this, TaskService.class);
        startService(intent);
    }
}复制代码

#2.在Service的启动命令中注册按钮点击广播

@Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        registerBroadCast();
        download();
        return super.onStartCommand(intent, flags, startId);
    }

/** * 注册按钮点击广播* */
    private void registerBroadCast() {
        myBroadcastReceiver = new MyBroadcastReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction(BROADCAST_ACTION_CLICK);
        registerReceiver(myBroadcastReceiver, filter);
    }


    /** * 更新通知界面的按钮的广播 */
    private class MyBroadcastReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            if (!intent.getAction().equals(BROADCAST_ACTION_CLICK)) {
                return;
            }
            Logger.d("status=" + status);
            switch (status) {
                case DOWNLOADING:
                    /**当在下载中点击暂停按钮**/
                    cancelable.cancel();
                    mRemoteViews.setTextViewText(R.id.bt, "下载");
                    mRemoteViews.setTextViewText(R.id.tv_message, "暂停中...");
                    status = Status.PAUSE;
                    notificationManager.notify(NOTIFICATION_ID, notification);
                    break;
                case SUCCESS:
                    /**当下载完成点击完成按钮时关闭通知栏**/
                    notificationManager.cancel(NOTIFICATION_ID);
                    break;
                case FAIL:
                case PAUSE:
                    /**当在暂停时点击下载按钮**/
                    download();
                    mRemoteViews.setTextViewText(R.id.bt, "暂停");
                    mRemoteViews.setTextViewText(R.id.tv_message, "下载中...");
                    status = Status.DOWNLOADING;
                    notificationManager.notify(NOTIFICATION_ID, notification);
                    break;
            }
        }
    }复制代码

#3.开始下载用xutils3

/** * 下载文件 */
    private void download() {
        final String url = "https://github.com/linglongxin24/DylanStepCount/raw/master/app-debug.apk";
        RequestParams requestParams = new RequestParams(url);
        String fileName = url.substring(url.lastIndexOf("/") + 1);
        file = new File(filePath, fileName);
        showNotificationProgress(TaskService.this);
        showFileName(fileName);
        requestParams.setSaveFilePath(file.getPath());
        /**自动为文件命名**/
        requestParams.setAutoRename(true);
        /**自动为文件断点续传**/
        requestParams.setAutoResume(true);

        cancelable = x.http().get(requestParams, new Callback.ProgressCallback<File>() {
            @Override
            public void onSuccess(File result) {
                Logger.d("下载完成");
                Logger.d("result=" + result.getPath());
                downloadSuccess();
            }

            @Override
            public void onError(Throwable ex, boolean isOnCallback) {
                Logger.d("下载异常");
                downloadFail();
            }

            @Override
            public void onCancelled(CancelledException cex) {
                Logger.d("下载已取消");
            }

            @Override
            public void onFinished() {

            }

            @Override
            public void onWaiting() {

            }

            @Override
            public void onStarted() {
            }

            @Override
            public void onLoading(long total, long current, boolean isDownloading) {
                Logger.d("total=" + total + "--" + "current=" + current);
                updateNotification(total, current);
            }
        });
    }复制代码

#4.显示通知

/** * 显示一个下载带进度条的通知 * * @param context 上下文 */
    public void showNotificationProgress(Context context) {
        /**进度条通知构建**/
        NotificationCompat.Builder builderProgress = new NotificationCompat.Builder(context);
        /**设置为一个正在进行的通知**/
        builderProgress.setOngoing(true);
        /**设置小图标**/
        builderProgress.setSmallIcon(R.mipmap.ic_launcher);

        /**新建通知自定义布局**/
        mRemoteViews = new RemoteViews(context.getPackageName(), R.layout.notification);
        /**进度条ProgressBar**/
        mRemoteViews.setProgressBar(R.id.pb, 100, 0, false);
        /**提示信息的TextView**/
        mRemoteViews.setTextViewText(R.id.tv_message, "下载中...");
        /**操做按钮的Button**/
        mRemoteViews.setTextViewText(R.id.bt, "暂停");
        /**设置左侧小图标*/
        mRemoteViews.setImageViewResource(R.id.iv, R.mipmap.ic_launcher);
        /**设置经过广播形式的PendingIntent**/
        Intent intent = new Intent(BROADCAST_ACTION_CLICK);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, REQUEST_CODE_BROADCAST, intent, 0);
        mRemoteViews.setOnClickPendingIntent(R.id.bt, pendingIntent);
        /**设置自定义布局**/
        builderProgress.setContent(mRemoteViews);
        /**设置滚动提示**/
        builderProgress.setTicker("开始下载...");
        notification = builderProgress.build();
        /**设置不可手动清除**/
        notification.flags = Notification.FLAG_NO_CLEAR;
        /**获取通知管理器**/
        notificationManager = (NotificationManager) context.getSystemService(context.NOTIFICATION_SERVICE);
        /**发送一个通知**/
        notificationManager.notify(NOTIFICATION_ID, notification);
    }复制代码

#5.显示通知的自定义布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="60dp" android:orientation="horizontal">

    <ImageView android:id="@+id/iv" android:layout_width="40dp" android:layout_height="40dp" />

    <LinearLayout android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_marginLeft="10dp" android:layout_marginRight="10dp" android:layout_weight="1" android:orientation="vertical">

        <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content">

            <TextView android:id="@+id/tv_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="随时随地" android:textColor="@color/colorAccent" android:textSize="12sp" />

        </LinearLayout>


        <ProgressBar android:id="@+id/pb" style="?android:attr/progressBarStyleHorizontal" android:layout_width="match_parent" android:layout_height="20dp" android:max="100" android:progressBackgroundTint="@color/colorPrimaryDark" android:progress="50" />

        <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content">

            <TextView android:id="@+id/tv_message" android:layout_width="wrap_content" android:layout_height="match_parent" android:text="正在下载中..." android:textColor="@color/colorAccent" android:textSize="12sp" />

            <TextView android:id="@+id/tv_progress" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_weight="1" android:layout_gravity="center_vertical" android:gravity="center" android:textColor="@color/colorAccent" android:textSize="12sp" />
            <TextView android:id="@+id/tv_size" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="@color/colorAccent" android:textSize="12sp" />
        </LinearLayout>
    </LinearLayout>

    <Button android:id="@+id/bt" android:layout_width="50dp" android:layout_height="30dp" android:layout_gravity="center_vertical" android:gravity="center" android:text="下载" android:textColor="@color/colorAccent" android:textSize="12sp" />
</LinearLayout>复制代码

#6.更新通知栏状态

/** * 在通知栏显示文件名 * * @param url 下载地址 */
    private void showFileName(String url) {
        mRemoteViews.setTextViewText(R.id.tv_name, url.substring(url.lastIndexOf("/") + 1));
        notificationManager.notify(NOTIFICATION_ID, notification);
    }

    /** * 下载更改进度 * * @param total 总大小 * @param current 当前已下载大小 */
    private void updateNotification(long total, long current) {
        mRemoteViews.setTextViewText(R.id.tv_size, formatSize(current) + "/" + formatSize(total));
        int result = Math.round((float) current / (float) total * 100);
        mRemoteViews.setTextViewText(R.id.tv_progress, result + "%");
        mRemoteViews.setProgressBar(R.id.pb, 100, result, false);
        notificationManager.notify(NOTIFICATION_ID, notification);
    }

    /** * 下载失败 */
    private void downloadFail() {
        status = Status.FAIL;
        if (!cancelable.isCancelled()) {
            cancelable.cancel();
        }
        mRemoteViews.setTextViewText(R.id.bt, "重试");
        mRemoteViews.setTextViewText(R.id.tv_message, "下载失败");
        notificationManager.notify(NOTIFICATION_ID, notification);
    }

    /** * 下载成功 */
    private void downloadSuccess() {
        status = Status.SUCCESS;
        mRemoteViews.setTextViewText(R.id.bt, "完成");
        mRemoteViews.setTextViewText(R.id.tv_message, "下载完成");
        notificationManager.notify(NOTIFICATION_ID, notification);
    }复制代码

#7.TaskService完整代码

package cn.bluemobi.dylan.servicetask;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Environment;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.support.v7.app.NotificationCompat;
import android.widget.RemoteViews;

import com.orhanobut.logger.Logger;

import org.xutils.common.Callback;
import org.xutils.http.RequestParams;
import org.xutils.x;

import java.io.File;

/** * Created by yuandl on 2016-12-19. */

public class TaskService extends Service {
    /**** * 发送广播的请求码 */
    private final int REQUEST_CODE_BROADCAST = 0X0001;
    /**** * 发送广播的action */
    private final String BROADCAST_ACTION_CLICK = "servicetask";
    /** * 通知 */
    private Notification notification;
    /** * 通知的Id */
    private final int NOTIFICATION_ID = 1;
    /** * 通知管理器 */
    private NotificationManager notificationManager;
    /** * 通知栏的远程View */
    private RemoteViews mRemoteViews;
    /** * 下载是否可取消 */
    private Callback.Cancelable cancelable;
    /** * 自定义保存路径，Environment.getExternalStorageDirectory()：SD卡的根目录 */
    private String filePath = Environment.getExternalStorageDirectory() + "/ServiceTask/";
    private File file;

    /** * 通知栏操做的四种状态 */
    private enum Status {
        DOWNLOADING, PAUSE, FAIL, SUCCESS
    }

    /** * 当前在状态 默认正在下载中 */
    private Status status = Status.DOWNLOADING;
    private MyBroadcastReceiver myBroadcastReceiver;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }


    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        registerBroadCast();
        download();
        return super.onStartCommand(intent, flags, startId);
    }

    /** * 注册按钮点击广播* */
    private void registerBroadCast() {
        myBroadcastReceiver = new MyBroadcastReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction(BROADCAST_ACTION_CLICK);
        registerReceiver(myBroadcastReceiver, filter);
    }


    /** * 更新通知界面的按钮的广播 */
    private class MyBroadcastReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            if (!intent.getAction().equals(BROADCAST_ACTION_CLICK)) {
                return;
            }
            Logger.d("status=" + status);
            switch (status) {
                case DOWNLOADING:
                    /**当在下载中点击暂停按钮**/
                    cancelable.cancel();
                    mRemoteViews.setTextViewText(R.id.bt, "下载");
                    mRemoteViews.setTextViewText(R.id.tv_message, "暂停中...");
                    status = Status.PAUSE;
                    notificationManager.notify(NOTIFICATION_ID, notification);
                    break;
                case SUCCESS:
                    /**当下载完成点击完成按钮时关闭通知栏**/
                    notificationManager.cancel(NOTIFICATION_ID);
                    break;
                case FAIL:
                case PAUSE:
                    /**当在暂停时点击下载按钮**/
                    download();
                    mRemoteViews.setTextViewText(R.id.bt, "暂停");
                    mRemoteViews.setTextViewText(R.id.tv_message, "下载中...");
                    status = Status.DOWNLOADING;
                    notificationManager.notify(NOTIFICATION_ID, notification);
                    break;
            }
        }
    }

    /** * 下载文件 */
    private void download() {
        final String url = "https://github.com/linglongxin24/DylanStepCount/raw/master/app-debug.apk";
        RequestParams requestParams = new RequestParams(url);
        String fileName = url.substring(url.lastIndexOf("/") + 1);
        file = new File(filePath, fileName);
        showNotificationProgress(TaskService.this);
        showFileName(fileName);
        requestParams.setSaveFilePath(file.getPath());
        /**自动为文件命名**/
        requestParams.setAutoRename(true);
        /**自动为文件断点续传**/
        requestParams.setAutoResume(true);

        cancelable = x.http().get(requestParams, new Callback.ProgressCallback<File>() {
            @Override
            public void onSuccess(File result) {
                Logger.d("下载完成");
                Logger.d("result=" + result.getPath());
                downloadSuccess();
            }

            @Override
            public void onError(Throwable ex, boolean isOnCallback) {
                Logger.d("下载异常");
                downloadFail();
            }

            @Override
            public void onCancelled(CancelledException cex) {
                Logger.d("下载已取消");
            }

            @Override
            public void onFinished() {

            }

            @Override
            public void onWaiting() {

            }

            @Override
            public void onStarted() {
            }

            @Override
            public void onLoading(long total, long current, boolean isDownloading) {
                Logger.d("total=" + total + "--" + "current=" + current);
                updateNotification(total, current);
            }
        });
    }

    /** * 显示一个下载带进度条的通知 * * @param context 上下文 */
    public void showNotificationProgress(Context context) {
        /**进度条通知构建**/
        NotificationCompat.Builder builderProgress = new NotificationCompat.Builder(context);
        /**设置为一个正在进行的通知**/
        builderProgress.setOngoing(true);
        /**设置小图标**/
        builderProgress.setSmallIcon(R.mipmap.ic_launcher);

        /**新建通知自定义布局**/
        mRemoteViews = new RemoteViews(context.getPackageName(), R.layout.notification);
        /**进度条ProgressBar**/
        mRemoteViews.setProgressBar(R.id.pb, 100, 0, false);
        /**提示信息的TextView**/
        mRemoteViews.setTextViewText(R.id.tv_message, "下载中...");
        /**操做按钮的Button**/
        mRemoteViews.setTextViewText(R.id.bt, "暂停");
        /**设置左侧小图标*/
        mRemoteViews.setImageViewResource(R.id.iv, R.mipmap.ic_launcher);
        /**设置经过广播形式的PendingIntent**/
        Intent intent = new Intent(BROADCAST_ACTION_CLICK);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, REQUEST_CODE_BROADCAST, intent, 0);
        mRemoteViews.setOnClickPendingIntent(R.id.bt, pendingIntent);
        /**设置自定义布局**/
        builderProgress.setContent(mRemoteViews);
        /**设置滚动提示**/
        builderProgress.setTicker("开始下载...");
        notification = builderProgress.build();
        /**设置不可手动清除**/
        notification.flags = Notification.FLAG_NO_CLEAR;
        /**获取通知管理器**/
        notificationManager = (NotificationManager) context.getSystemService(context.NOTIFICATION_SERVICE);
        /**发送一个通知**/
        notificationManager.notify(NOTIFICATION_ID, notification);
    }


    /** * 在通知栏显示文件名 * * @param url 下载地址 */
    private void showFileName(String url) {
        mRemoteViews.setTextViewText(R.id.tv_name, url.substring(url.lastIndexOf("/") + 1));
        notificationManager.notify(NOTIFICATION_ID, notification);
    }

    /** * 下载更改进度 * * @param total 总大小 * @param current 当前已下载大小 */
    private void updateNotification(long total, long current) {
        mRemoteViews.setTextViewText(R.id.tv_size, formatSize(current) + "/" + formatSize(total));
        int result = Math.round((float) current / (float) total * 100);
        mRemoteViews.setTextViewText(R.id.tv_progress, result + "%");
        mRemoteViews.setProgressBar(R.id.pb, 100, result, false);
        notificationManager.notify(NOTIFICATION_ID, notification);
    }

    /** * 下载失败 */
    private void downloadFail() {
        status = Status.FAIL;
        if (!cancelable.isCancelled()) {
            cancelable.cancel();
        }
        mRemoteViews.setTextViewText(R.id.bt, "重试");
        mRemoteViews.setTextViewText(R.id.tv_message, "下载失败");
        notificationManager.notify(NOTIFICATION_ID, notification);
    }

    /** * 下载成功 */
    private void downloadSuccess() {
        status = Status.SUCCESS;
        mRemoteViews.setTextViewText(R.id.bt, "完成");
        mRemoteViews.setTextViewText(R.id.tv_message, "下载完成");
        notificationManager.notify(NOTIFICATION_ID, notification);
    }

    /** * 格式化文件大小 * * @param size * @return */
    private String formatSize(long size) {
        String format;
        if (size >= 1024 * 1024) {
            format = byteToMB(size) + "M";
        } else if (size >= 1024) {
            format = byteToKB(size) + "k";
        } else {
            format = size + "b";
        }
        return format;
    }

    /** * byte转换为MB * * @param bt 大小 * @return MB */
    private float byteToMB(long bt) {
        int mb = 1024 * 1024;
        float f = (float) bt / (float) mb;
        float temp = (float) Math.round(f * 100.0F);
        return temp / 100.0F;
    }

    /** * byte转换为KB * * @param bt 大小 * @return K */
    private int byteToKB(long bt) {
        return Math.round((bt / 1024));
    }

    /** * 销毁时取消下载，并取消注册广播，防止内存溢出 */
    @Override
    public void onDestroy() {
        if (cancelable != null && !cancelable.isCancelled()) {
            cancelable.cancel();
        }
        if (myBroadcastReceiver != null) {
            unregisterReceiver(myBroadcastReceiver);
        }
        super.onDestroy();
    }

}复制代码

8.GitHub