Question

我正在尝试使用基本计时器在Android上工作，我在onCreate（）方法中有以下代码：

    editText = (EditText) findViewById(R.id.edit_message);
    Timer time = new Timer();     

    time.schedule(new TimerTask() {
        public void run() {
            timesince++;
            editText.setText("Timeran:"+timesince);
            Log.d("TIMER", "TimerTask run");
        }}, 0, 1000);

所以希望它会以更高的值（timesince）更新文本框 - 它在程序的顶部声明，以及editText ......

然而，（虽然我没有编译问题）当我在模拟器上运行它时根本不起作用。 App说'blahblahblah已停止工作......'

我做错了吗？我错过了什么？

非常感谢。

（如果删除此代码，P.S.App工作正常，因此我知道此部分存在问题。）

编辑：我相信这是我的logcat输出，对不起文字墙：

10-11 03:40:49.260: E/AndroidRuntime(561): FATAL EXCEPTION: Timer-0
10-11 03:40:49.260: E/AndroidRuntime(561): android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:3939)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.view.ViewRootImpl.invalidateChild(ViewRootImpl.java:714)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.view.ViewRootImpl.invalidateChildInParent(ViewRootImpl.java:763)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.view.ViewGroup.invalidateChild(ViewGroup.java:4012)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.view.View.invalidate(View.java:8454)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.widget.TextView.invalidateCursor(TextView.java:4319)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.widget.TextView.spanChange(TextView.java:7670)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.widget.TextView$ChangeWatcher.onSpanAdded(TextView.java:8020)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.text.SpannableStringBuilder.sendSpanAdded(SpannableStringBuilder.java:898)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:614)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.text.SpannableStringBuilder.setSpan(SpannableStringBuilder.java:520)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.text.Selection.setSelection(Selection.java:76)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.text.Selection.setSelection(Selection.java:87)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.text.method.ArrowKeyMovementMethod.initialize(ArrowKeyMovementMethod.java:302)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.widget.TextView.setText(TextView.java:3244)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.widget.TextView.setText(TextView.java:3110)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.widget.EditText.setText(EditText.java:78)
10-11 03:40:49.260: E/AndroidRuntime(561):  at android.widget.TextView.setText(TextView.java:3085)
10-11 03:40:49.260: E/AndroidRuntime(561):  at com.example.cultivation.MainActivity$1.run(MainActivity.java:54)
10-11 03:40:49.260: E/AndroidRuntime(561):  at java.util.Timer$TimerImpl.run(Timer.java:284)

Answer 1

android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

这是问题

您必须将更新ui的后台任务部分移动到主线程或在UI线程中创建mHandler;

<强>更新

从计时器更新用户界面：http://android-developers.blogspot.com/2007/11/stitch-in-time.html

Answer 2

或使用handler来运行更新textview：

     private final Runnable mRunnable1 = new Runnable() {

     public void run() {
        timesince++;
        editText.setText("Timeran:"+timesince);
        Log.d("TIMER", "TimerTask run");

 mHandler.postDelayed(mRunnable1, 1000);
 }

 };

并在OnCreate()方法mHandler.postDelayed(mRunnable1, 1000);

中调用此行

Answer 3

尝试从UI线程更新TextView。尝试使用处理程序。在这里你可以找到一篇很好的文章。 Update textview with the help of Handler

Answer 4

执行以下操作：

将Timer声明为全局变量，并按如下方法调用timer函数：

   public void startThread(){
    time.schedule(new TimerTask() {
    public void run() {
        timesince++;
        editText.setText("Timeran:"+timesince);
        Log.d("TIMER", "TimerTask run");
    }}, 0, 1000);
    }

并在startThread()

中调用此onCreate()函数

Android Simple Timer / Timertask问题

4 个答案: