(Android实战)ProgressDialog+Thread实现弹出进度条数据异步加载(配有效果图)
1 效果图
2 实现说明
实现流程
Step One 弹出进度条对话框
Step Two 执行线程,在线程中实现数据的异步加载
Step Three 在线程数据加载完成后,调用Handler并集合数据,更新界面
3源码
//添加异步操作
m_Dialog=ProgressDialog.show(m_context, "请等待...", "正在下载安装文件,请稍后...",true);
//mRegsiterHandler.sleep(100);
new Thread(new Runnable(){
@Override
publicvoid run() {
//加载数据
result=0;
try{
//下载文件
String url="http://00.00.00.00:80/nationaltest.html";
HttpClient client =new DefaultHttpClient();
HttpGet get =new HttpGet(url);
HttpResponse response;
response = client.execute(get);
HttpEntity entity = response.getEntity();
long length = entity.getContentLength();
InputStream is = entity.getContent();
FileOutputStream fileOutputStream =null;
if (is !=null) {
File file =new File(Environment.getExternalStorageDirectory(), "nationaltest.apk");
fileOutputStream =new FileOutputStream(file);
byte[] buf =newbyte[1024];
int ch =-1;
while ((ch = is.read(buf)) !=-1) {
fileOutputStream.write(buf, 0, ch);
}
}
fileOutputStream.flush();
if (fileOutputStream !=null) {
fileOutputStream.close();
}
result=2;
}
catch(Exception ex){
result=-1;
}
//更新界面
// Update the progress bar
mHandler.post(new Runnable() {
publicvoid run() {
if(result==2)
install();
else
Toast.makeText(m_context, "下载文件失败,请检查网络连接", Toast.LENGTH_SHORT).show();
}
});
m_Dialog.dismiss();
}}).start();
}