1.把下载和查询下载进度的方法分开
//服务器中APK下载地址
private String updateurl;
private Context context;
// 下载应用的进度条
private ProgressDialog mProgressDialog;
//下载唯一ID
private long refernece;
private DownloadManager downloadManager;
/**
* 从服务器中下载APK
*/
private void downLoadApk() {
if (TextUtils.isEmpty(updateurl)) {
return;
}
try {
String serviceString = Context.DOWNLOAD_SERVICE;
context = this.getApplicationContext();
downloadManager = (DownloadManager) context.getSystemService(serviceString);
//将下载地址url放入uri中
Uri uri = Uri.parse(updateurl);
DownloadManager.Request request = new DownloadManager.Request(uri);
request.allowScanningByMediaScanner();
request.setVisibleInDownloadsUi(true);
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setMimeType("application/vnd.android.package-archive");
//文件如果存在，则删除原来文件
File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/app-debug/", "app-debug.apk");
if (file.exists()) {
file.delete();
} request.setDestinationInExternalPublicDir(Environment.getExternalStorageDirectory().getAbsolutePath() + "/app-debug/", "app-debug.apk");
//获得唯一下载id
refernece = downloadManager.enqueue(request);
//将id放进Intent
Intent localIntent = new Intent(BROADCAST_ACTION);
localIntent.putExtra(EXTENDED_DATA_STATUS, refernece);
} catch (Exception exception) {
Toast.makeText(getApplicationContext(), "下载新版本失败", Toast.LENGTH_SHORT).show();
loginMain();
}
}
/**
* 查询下载状态
*/
private void searchStatus(){
String serviceString = Context.DOWNLOAD_SERVICE;
context = this.getApplicationContext();
downloadManager = (DownloadManager) context.getSystemService(serviceString);
//查询下载信息
DownloadManager.Query query=new DownloadManager.Query();
query.setFilterById(refernece);
try{
boolean isGoging=true;
while(isGoging){
Cursor cursor = downloadManager.query(query);
if (cursor != null && cursor.moveToFirst()) {
//获取当前下载量
long downloadedBytes = cursor.getLong(
cursor.getColumnIndexOrThrow(DownloadManager.COLUMN_BYTES_DOWNLOADED_SO_FAR));
long totalBytes = cursor.getLong(
cursor.getColumnIndexOrThrow(DownloadManager.COLUMN_TOTAL_SIZE_BYTES));
mProgressDialog.setMax(((int) (totalBytes / 1024)));
int status = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS));
switch(status){
case DownloadManager.STATUS_RUNNING:
mProgressDialog.setProgress(((int) (downloadedBytes / 1024)));
if(!mProgressDialog.isShowing()){
mProgressDialog.show();
}
break;
//如果下载状态为成功
case DownloadManager.STATUS_SUCCESSFUL:
isGoging=false;
mProgressDialog.dismiss();
installApkDialog();
case DownloadManager.STATUS_FAILED:
isGoging = false;
Toast.makeText(getApplicationContext(), "下载新版本失败", Toast.LENGTH_SHORT).show();
loginMain();
break;
case DownloadManager.STATUS_PAUSED:
searchReason();
break;
}
}
if(cursor!=null){
cursor.close();
}
}
}catch(Exception e){
e.printStackTrace();
}
}
2.显示进度条
/**
* 下载进度显示
*/
private void getProgressDialog() {
mProgressDialog = new ProgressDialog(this);
mProgressDialog.setProgressNumberFormat("%1d KB/%2d KB");
mProgressDialog.setMessage("正在更新...");
mProgressDialog.setIndeterminate(false);
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);//水平进度条
mProgressDialog.setCancelable(true);//设置是否可以通过点击Back键取消
mProgressDialog.show();
new Thread(){
public void run(){
try {
Looper.prepare();
downLoadApk();
searchStatus();
Looper.loop();
} catch (Exception e) {
e.printStackTrace();
}
}
}.start();
}
Android中的Looper类，是用来封装消息循环和消息队列的一个类，用于在android线程中进行消息处理。handler其实可以看做是一个工具类，用来向消息队列中插入消息的。
先调用Looper.prepare()启用Looper；Looper.loop(); loop函数从MessageQueue中从前往后取出Message，Looper.loop()中是个while循环，只有对它所在线程的Looper调用了quit()函数，Looper.loop()函数才能完成。
