我知道我在做一些愚蠢的事在這裏,但下面的代碼:Android的處理程序問題
...
public void onClick(View v) {
extractThread et = new extractThread();
et.start();
}
...
private class extractThread extends Thread{
public void run(){
expensiveOperation();
Message m = new Message();
Bundle b = new Bundle();
b.putString("message","result");
m.setData(b);
extractHandler.dispatchMessage(m);
}
}
private Handler extractHandler = new Handler(){
public void handleMessage(Message m){
Bundle b = m.getData();
String message = b.getString("message");
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setMessage(message)
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
builder.create().show();
}
};
卻依然向
01-07 11:55:02.791: ERROR/AndroidRuntime(18791): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
在該行builder.create().show();
,儘管這是在handleMessage
的主線程中調用Handler。我究竟做錯了什麼?
謝謝,非常有幫助的建議,它是使用`dispatchMessage()`這是問題。 – fredley 2011-01-07 12:36:39