點擊ProgressBar Test按鈕后會出現(xiàn)“AsyncTask"已停止運行的錯誤是為什么呀？
public class ProgressBarTest extends Activity {
private ProgressBar mProgressBar;
private MyAsyncTask mTask;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.progressbar);
mProgressBar = (ProgressBar) findViewById(R.id.progress);
mTask = new MyAsyncTask();
? ?mTask.execute(); // 啟動
}
class MyAsyncTask extends AsyncTask<Void, Integer, Void> {
@Override
protected Void doInBackground(Void... arg0) {
/* for循環(huán)模擬進度條的更新 */
for (int i = 0; i < 100; i++) {
? ?if(isCancelled()){
? ? break;
? ?}
publishProgress(i);
try {
Thread.sleep(300);// 增加一個睡眠時間
} catch (InterruptedException e) {
e.printStackTrace();
}
}
return null;
}
@Override
protected void onProgressUpdate(Integer... values) {
// TODO Auto-generated method stub
super.onProgressUpdate(values);
// 獲取進度更新值
mProgressBar.setProgress(values[0]);
}
}
}
2016-06-12
你的主Activity.JAVA中有沒有設置button的點擊事件呀? ?或者在manifest中有沒有注冊ACTIVITY?