OnProgressUpdate 无法在 TextView 中设置文本

Question

protected Long doInBackground(String... address) {
            while(true){
                try {
                    Thread.sleep(5000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                setProgress(100);
                onProgressUpdate(getping(address[0]));
            }
        }    

protected void onProgressUpdate(Long... values){
                result.setText(String.valueOf(values[0]));
                builder.setContentText(String.valueOf(values[0]));
                notificationManager.notify(1,builder.build());
            }

此块在 Android Oreo 及更高版本上工作正常，但无法在以下任何版本上设置文本

日志猫：-

11-05 16:18:26.041 4720-4752/com.pcartistofficial.pingtesterforgames E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1 Process: com.pcartistofficial.pingtesterforgames, PID: 4720 java.lang.RuntimeException: An error occured while executing doInBackground () at android.os.AsyncTask$3.done(AsyncTask.java:304) at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355) at java.util.concurrent.FutureTask.setException(FutureTask.java: 222) at java.util.concurrent.FutureTask.run(FutureTask.java:242) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) at java.util.concurrent.ThreadPoolExecutor .runWorker(ThreadPoolExecutor.java:1112) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) at java.lang.Thread.run(Thread.java:818) Caused by: android.view. ViewRootImpl$CalledFromWrongThreadException：只有创建视图层次结构的原始线程才能接触其视图。 at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:6357) at android.view.ViewRootImpl.invalidateChildInParent(ViewRootImpl.java:909) at android.view.ViewGroup.invalidateChild(ViewGroup.java:4690) at android.view. View.invalidateInternal(View.java:11801) at android.view.View.invalidate(View.java:11765) at android.view.View.invalidate(View.java:11749) at android.widget.TextView.checkForRelayout(TextView .java:6858) at android.widget.TextView.setText(TextView.java:4057) at ZC31B32364C E19CA8FCD150A417ECCE58Z.widget.TextView.setText(TextView.java:3915) at android.widget.TextView.setText(TextView.java:3890) at com.pcartistofficial.pingtesterforgames.MainActivity$BackgroundTasker.onProgressUpdate(MainActivity.java:96) at com .pcartistofficial.pingtesterforgames.MainActivity$BackgroundTasker.doInBackground(MainActivity.java:90) at com.pcartistofficial.pingtesterforgames.MainActivity$BackgroundTasker.doInBackground(MainActivity.java:67) at android.os.AsyncTask$2.call(AsyncTask.java: 292）在 java.util.concurrent.FutureTask.run（FutureTask.java： 237) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) at java.util.concurrent.ThreadPoolExecutor$Worker.run( ThreadPoolExecutor.java:587) 在 java.lang.Thread.run(Thread.java:818)

Answer 1

我假设您直接在 doInBackground 方法中调用此方法会导致此异常。 相反，尝试在调用 onProgressUpdate 方法的 doInBackground 方法中调用 publishProgress({your values})

参考 AsyncTask API 文档