/** 异步任务执行过程中调用方法. 必须在doInBackground方法中调用publishProgress()方法发送消息 */
@Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
int progress = values[0];
Logs.v("onProgressUpdate >>>>>> " + progress);
mSeekBar.setProgress(progress);
mShowMessageTxt.setText("" + progress);
}
/** 后台（子线程）执行异步任务 */
@Override
protected String doInBackground(String... params) {
Logs.v("doInBackground >>>>>> ");
String url1 = params[0];
String url2 = params[1];
Logs.v("url1 : " + url1 + "\n url2 :" + url2);
for (int i = 1; i <= 100; i++) {
publishProgress(i);
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
String result = "下载成功";
return result;
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.async_start_btn:
new Thread(
new Runnable() {
@Override
public void run() {
for (int i = 0; i < 100; i++) {
mSeekBar.setProgress(i);
try {
Thread.sleep(50);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
})
.start();
break;
case R.id.async_load_btn:
String url = "http://www.baidu.com/mm.png";
String url1 = "http://www.baidu.com/mm1.png";
mAsyncTask = new MyAsyncTask();
mAsyncTask.execute(url, url1);
/** 默认排队执行异步任务， 每执行一次异步任务将被放任务队列 */
break;
case R.id.async_stop_btn:
Logs.v("mAsyncTask.isCancelled() :" + mAsyncTask.isCancelled());
if (!mAsyncTask.isCancelled()) {
mAsyncTask.cancel(true); // 停止异步任务
Logs.v("mAsyncTask.cancel(true); //停止异步任务");
}
break;
}
}
/** 执行异步任务前调用方法 */
@Override
protected void onPreExecute() {
super.onPreExecute();
Logs.v("onPreExecute >>>>>> ");
}
/** 异步任务执行完成后调用方法 */
@Override
protected void onPostExecute(String result) {
Logs.v("onPostExecute >>>>>> ");
super.onPostExecute(result);
mShowMessageTxt.setText(result);
}