1.把下載和查詢下載進度的方法分開
//服務(wù)器中APK下載地址
private String updateurl;
private Context context;
// 下載應(yīng)用的進度條
private ProgressDialog mProgressDialog;
//下載唯一ID
private long refernece;
private DownloadManager downloadManager;
/**
* 從服務(wù)器中下載APK
*/
private void downLoadApk() {
if (TextUtils.isEmpty(updateurl)) {
return;
}
try {
String serviceString = Context.DOWNLOAD_SERVICE;
context = this.getApplicationContext();
downloadManager = (DownloadManager) context.getSystemService(serviceString);
//將下載地址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");
//文件如果存在骗爆，則刪除原來文件
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");
//獲得唯一下載id
refernece = downloadManager.enqueue(request);
//將id放進Intent
Intent localIntent = new Intent(BROADCAST_ACTION);
localIntent.putExtra(EXTENDED_DATA_STATUS, refernece);
} catch (Exception exception) {
Toast.makeText(getApplicationContext(), "下載新版本失敗", Toast.LENGTH_SHORT).show();
loginMain();
}
}
/**
* 查詢下載狀態(tài)
*/
private void searchStatus(){
String serviceString = Context.DOWNLOAD_SERVICE;
context = this.getApplicationContext();
downloadManager = (DownloadManager) context.getSystemService(serviceString);
//查詢下載信息
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()) {
//獲取當前下載量
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;
//如果下載狀態(tài)為成功
case DownloadManager.STATUS_SUCCESSFUL:
isGoging=false;
mProgressDialog.dismiss();
installApkDialog();
case DownloadManager.STATUS_FAILED:
isGoging = false;
Toast.makeText(getApplicationContext(), "下載新版本失敗", Toast.LENGTH_SHORT).show();
loginMain();
break;
case DownloadManager.STATUS_PAUSED:
searchReason();
break;
}
}
if(cursor!=null){
cursor.close();
}
}
}catch(Exception e){
e.printStackTrace();
}
}
2.顯示進度條
/**
* 下載進度顯示
*/
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);//水平進度條
mProgressDialog.setCancelable(true);//設(shè)置是否可以通過點擊Back鍵取消
mProgressDialog.show();
new Thread(){
public void run(){
try {
Looper.prepare();
downLoadApk();
searchStatus();
Looper.loop();
} catch (Exception e) {
e.printStackTrace();
}
}
}.start();
}
Android中的Looper類，是用來封裝消息循環(huán)和消息隊列的一個類踏揣，用于在android線程中進行消息處理靶溜。handler其實可以看做是一個工具類，用來向消息隊列中插入消息的夜焦。
先調(diào)用Looper.prepare()啟用Looper壳澳；Looper.loop(); loop函數(shù)從MessageQueue中從前往后取出Message，Looper.loop()中是個while循環(huán)茫经，只有對它所在線程的Looper調(diào)用了quit()函數(shù)巷波，Looper.loop()函數(shù)才能完成。
