我有一个带有一个 TextView 和两个按钮的简单程序:Button1 和 Button2。
单击按钮 1 将启动一个计数器,每 1 秒增加 1 并在 TextView 上显示结果;叮当按钮 2 将停止它。这是我的 Button1 代码的一部分。但它不起作用。
Timer T=new Timer();
T.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
myTextView.setText("count="+count);
count++;
}
}, 1000, 1000);
我知道使用 Thread 有一些类似的问题,但似乎他们没有提到停止计数器。
任何建议都非常感谢。
添加:
你好,我只是从一个更大的程序中缩短了我的代码,但它仍然崩溃了:
package com.example.hello;
import java.util.Timer;
import java.util.TimerTask;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView myTextView;
int count=0;
Timer T;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myTextView=(TextView)findViewById(R.id.t);
T=new Timer();
T.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
myTextView.setText("count="+count);
count++;
}
}, 1000, 1000);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
日志文件(我不想发布,因为它太长但有人要求它):
07-28 17:35:07.012: W/dalvikvm(11331): threadid=7: thread exiting with uncaught exception (group=0x4001d800)
07-28 17:35:07.016: E/AndroidRuntime(11331): FATAL EXCEPTION: Timer-0
07-28 17:35:07.016: E/AndroidRuntime(11331): android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
07-28 17:35:07.016: E/AndroidRuntime(11331): at android.view.ViewRoot.checkThread(ViewRoot.java:2802)
07-28 17:35:07.016: E/AndroidRuntime(11331): at android.view.ViewRoot.requestLayout(ViewRoot.java:594)
07-28 17:35:07.016: E/AndroidRuntime(11331): at android.view.View.requestLayout(View.java:8125)
07-28 17:35:07.016: E/AndroidRuntime(11331): at android.view.View.requestLayout(View.java:8125)
07-28 17:35:07.016: E/AndroidRuntime(11331): at android.view.View.requestLayout(View.java:8125)
07-28 17:35:07.016: E/AndroidRuntime(11331): at android.view.View.requestLayout(View.java:8125)
07-28 17:35:07.016: E/AndroidRuntime(11331): at android.widget.RelativeLayout.requestLayout(RelativeLayout.java:254)
07-28 17:35:07.016: E/AndroidRuntime(11331): at android.view.View.requestLayout(View.java:8125)
07-28 17:35:07.016: E/AndroidRuntime(11331): at android.widget.TextView.checkForRelayout(TextView.java:5378)
07-28 17:35:07.016: E/AndroidRuntime(11331): at android.widget.TextView.setText(TextView.java:2688)
07-28 17:35:07.016: E/AndroidRuntime(11331): at android.widget.TextView.setText(TextView.java:2556)
07-28 17:35:07.016: E/AndroidRuntime(11331): at android.widget.TextView.setText(TextView.java:2531)
07-28 17:35:07.016: E/AndroidRuntime(11331): at com.example.hello.MainActivity$1.run(MainActivity.java:21)
07-28 17:35:07.016: E/AndroidRuntime(11331): at java.util.Timer$TimerImpl.run(Timer.java:289)