1.下载工具类
/**
* 下载app
*/
public class DownloadUtils {
//下载器
private DownloadManager downloadManager;
private Context mContext;
//下载的ID
private long DOWNLOAD_ID;
private String name;
private String apkPath;
public DownloadUtils(Context context, String url, String name) {
this.mContext = context;
this.name = name;
downloadAPK(url, name);
}
//下载apk
private void downloadAPK(String url, String name) {
//创建下载任务
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
//移动网络情况下是否允许漫游
request.setAllowedOverRoaming(false);
//在通知栏中显示，默认就是显示的
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setTitle("VIPKID Parent App");
request.setDescription(mContext.getString(R.string.down_loading));
request.setShowRunningNotification(true);//是否显示下载进度提示
request.setVisibleInDownloadsUi(true);
//设置下载的路径
File file = new File(mContext.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS), name);
request.setDestinationUri(Uri.fromFile(file));
apkPath = file.getAbsolutePath();
Log.d("TAGAAA", "downloadAPK: " + apkPath);
//获取DownloadManager
if (downloadManager == null)
downloadManager = (DownloadManager) mContext.getSystemService(Context.DOWNLOAD_SERVICE);
//将下载请求加入下载队列，加入下载队列后会给该任务返回一个long型的id，通过该id可以取消任务，重启任务、获取下载的文件等等
if (downloadManager != null) {
DOWNLOAD_ID = downloadManager.enqueue(request);
}
//注册广播接收者，监听下载状态
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(DownloadManager.ACTION_DOWNLOAD_COMPLETE);
mContext.registerReceiver(receiver,intentFilter);
}
//广播监听下载的各个状态
private BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
checkStatus();
}
};
//检查下载状态
public void checkStatus() {
DownloadManager.Query query = new DownloadManager.Query();
//通过下载的id查找
query.setFilterById(DOWNLOAD_ID);
Cursor cursor = downloadManager.query(query);
if (cursor.moveToFirst()) {
int status = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS));
switch (status) {
//下载暂停
case DownloadManager.STATUS_PAUSED:
Log.d("TAGAAA", "checkStatus: 下载暂停");
Message paused = new Message();
paused.what = 0x101;
paused.obj="下载暂停";
EventBus.getDefault().post(paused);
break;
//下载延迟
case DownloadManager.STATUS_PENDING:
Log.d("TAGAAA", "checkStatus: 下载延迟");
Message pending = new Message();
pending.what = 0x101;
pending.obj="下载延迟";
EventBus.getDefault().post(pending);
break;
//正在下载
case DownloadManager.STATUS_RUNNING:
Log.d("TAGAAA", "checkStatus: 正在下载");
Message running = new Message();
running.what = 0x101;
running.obj=mContext.getString(R.string.down_loading);
EventBus.getDefault().post(running);
break;
//下载完成
case DownloadManager.STATUS_SUCCESSFUL:
//下载完成安装APK
installAPK();
cursor.close();
Message message = new Message();
message.what = 0x100;
message.obj=mContext.getString(R.string.download_complete);
EventBus.getDefault().post(message);
Log.d("TAGAAA", "checkStatus: 下载完成");
break;
//下载失败
case DownloadManager.STATUS_FAILED:
cursor.close();
Message failed = new Message();
failed.what = 0x100;
failed.obj="下载失败";
EventBus.getDefault().post(failed);
mContext.unregisterReceiver(receiver);
Log.d("TAGAAA", "checkStatus: 下载失败");
break;
default:
Message msg = new Message();
msg.what = 0x101;
msg.obj="取消下载";
EventBus.getDefault().post(msg);
}
}
}
private void installAPK() {
setPermission(apkPath);
Intent intent = new Intent(Intent.ACTION_VIEW);
// 由于没有在Activity环境下启动Activity,设置下面的标签
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//Android 7.0以上要使用FileProvider
if (Build.VERSION.SDK_INT >= 24) {
File file = (new File(apkPath));
//参数1 上下文, 参数2 Provider主机地址 和配置文件中保持一致 参数3 共享的文件
Uri apkUri = FileProvider.getUriForFile(mContext, "com.lxtwsw.weather.fileprovider", file);
//添加这一句表示对目标应用临时授权该Uri所代表的文件
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.setDataAndType(apkUri, "application/vnd.android.package-archive");
} else {
intent.setDataAndType(Uri.fromFile(new File(Environment.DIRECTORY_DOWNLOADS, name)), "application/vnd.android.package-archive");
}
mContext.startActivity(intent);
}
//修改文件权限
private void setPermission(String absolutePath) {
String command = "chmod " + "777" + " " + absolutePath;
Runtime runtime = Runtime.getRuntime();
try {
runtime.exec(command);
} catch (IOException e) {
e.printStackTrace();
}
}
//判断任务下载状态
private boolean isDownloading(String url) {
DownloadManager.Query query = new DownloadManager.Query();
query.setFilterByStatus(DownloadManager.STATUS_RUNNING | DownloadManager.STATUS_PENDING);
Cursor cursor = downloadManager.query(query);
if (cursor.moveToFirst()) {
if (cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_URI)).equals(url)) {
Toast.makeText(mContext, "任务已经存在", Toast.LENGTH_SHORT).show();
cursor.close();
return true;
}
}
cursor.close();
return false;
}
}
2.在res 下创建xml
3.在清单文件AndroidManifest.xml 下声明
4.使用
downloadUtils = new DownloadUtils(getContext(), url, "intl_parent.apk");