android 通知（1）

//通知管理器
private NotificationManager nmanager;
// 统治构造器
private Notification.Builder builder ;

/**
*通知初始化
*/
private void getNotification() {
　　　　　//通知管理器
nmanager = (NotificationManager) getSystemService(
　　　　　　Context.NOTIFICATION_SERVICE);//系统通知
　　　　　//通过构造器设置通知的标题和内容
builder = new Notification.Builder(getApplicationContext());
builder.setSmallIcon(R.drawable.ic_launcher);
builder.setTicker("通知来了");//提示标题
builder.setContentTitle("下载");    //通知内容标题
builder.setContentText("正在下载。。。。。");//通知内容
}

/**
* 更新UI
*/
private Handler handler = new Handler() {
public void handleMessage(Message msg) {//接收线程发送来的消息
//更新UI
builder.setProgress(100, msg.arg1, false);
　　　　　　　//1001是该通知的唯一编号，可以调用nmanager.cancel(1001);注销这个通知
nmanager.notify(1001, builder.build());
if(msg.what == 1){
//下载完成
String name = uri.split("/")[-1];
builder.setContentTitle(name);
builder.setContentText("下载完成");
Toast.makeText(getApplicationContext(), "下载完成", 1).show();
}
}
};

/**
*  下载放在线程中执行，
*
*/
public class MyRunnable implements Runnable {
@Override
public void run() {
//读取的数据存储
byte[]  result = null;
HttpClient client = new DefaultHttpClient();
try {
Log.i("tag", "uri>>"+uri);
HttpGet get = new HttpGet(uri);
HttpResponse response = client.execute(get);
HttpEntity entity = response.getEntity();
int stateCode = response.getStatusLine().getStatusCode();
if(stateCode != 200){
Log.i("tag", stateCode+"-->下载失败-->");
}
//获取网络输入流
InputStream in = entity.getContent();
//获取网路数据总长度
long total  = entity.getContentLength();
byte[] bs = new byte[256];
int len_per = 0;//每次读取的长度，
ByteArrayOutputStream baos = new  ByteArrayOutputStream();
int readedLen = 0;//已经读取的数据量
while((len_per = in.read(bs)) != -1){
baos.write(bs, 0, len_per);
readedLen += len_per;
int progress = (int) ((readedLen*100)/(float)total);
Message msg = Message.obtain();
msg.arg1 = progress;
handler.sendMessage(msg);
}
result = baos.toByteArray();
handler.sendEmptyMessage(1);
}catch(Exception e){
e.printStackTrace();
}finally {
if(client != null){
client.getConnectionManager().shutdown();
}
}
}
}