Android 使用 AsyncTask 启动活动
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Using AsyncTask to start activity
提问by Mahmoud Emam
I am using asyncTask to show Dialog and then after few minutes then launch a new activity.
我正在使用 asyncTask 来显示 Dialog，然后在几分钟后启动一个新活动。
unfortunately that activity start before task finished ???
不幸的是，该活动在任务完成之前开始？？？
package com.android.grad;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.widget.Toast;
public class LoginTask extends AsyncTask<Void, Void, Boolean> {
private Activity activity;
private ProgressDialog pd;
public LoginTask(Activity activity) {
this.activity = activity;
}
@Override
protected void onPreExecute() {
pd = ProgressDialog.show(activity, "Signing in",
"Please wait while we are signing you in..");
}
@Override
protected Boolean doInBackground(Void... arg0) {
try {
Thread.sleep(10000000);
} catch (InterruptedException e) {
}
pd.dismiss();
return true;
}
@Override
protected void onPostExecute(Boolean result) {
Toast.makeText(activity, Boolean.toString(result), Toast.LENGTH_LONG).show();
}
}
}
and i execute the task from button click listener :S
我从按钮单击侦听器执行任务：S
private OnClickListener loginOnClick = new OnClickListener() {
public void onClick(View v) {
new LoginTask(LoginActivity.this).execute();
startActivity(new Intent(LoginActivity.this, BuiltInCamera.class));
}
};
Is there way to startActivity from my subClass ofAsyncTask .
有没有办法从我的 AsyncTask 子类 startActivity 。
回答by waqaslam
Yes, you can start activity from AsyncTask's sub class. See below:
是的，您可以从 AsyncTask 的子类开始活动。见下文：
@Override
protected void onPostExecute(Boolean result) {
Toast.makeText(activity, Boolean.toString(result), Toast.LENGTH_LONG).show();
activity.startActivity(new Intent(activity, BuiltInCamera.class));
}
After making this change, make sure you do remove startActivityfrom OnClickListener
进行此更改后，请确保您删除startActivity从OnClickListener
回答by Raghu Nagaraju
Call startActivityinside onPostExecutemethod of AsyncTask
调用startActivity内部onPostExecute方法AsyncTask
回答by Shrikant
Call this startActivity(new Intent(LoginActivity.this, BuiltInCamera.class));from onPostExecute()after Displaying toast message.
调用此startActivity(new Intent(LoginActivity.this, BuiltInCamera.class));从onPostExecute()显示敬酒消息之后。
In this way, new activity will be called after your AsyncTaskis over.
这样，您AsyncTask结束后将调用新的活动。
回答by Atish Dabholkar
You can also use
你也可以使用
Intent intent = new Intent(activity, PageViewActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
activity.getApplicationContext().startActivity(intent);
