我想写一个实时计数器。我试图使用线程,但android警告我只有活动线程可能触摸视图。我找到了runOnUiThread
的解决方案,但它也不起作用
public class CounterInRealTimeExampleActivity extends Activity {
private TextView textView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LinearLayout layout = new LinearLayout(this);
textView = new TextView(this);
textView.setTag(new Integer(0));
layout.addView(textView);
setContentView(layout);
runOnUiThread(new Runnable() {
@Override
public void run() {
//while(true)
{
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
increment();
}
}
});
}
public void increment() {
textView.setTag(new Integer((Integer)textView.getTag())+1);
textView.setText(Integer.toString((Integer)textView.getTag()));
}
}
答案 0 :(得分:4)
我在这里粘贴代码。这可能对你有所帮助..
class UpdateTimeTask extends TimerTask {
public void run() {
String time = DateUtils.now("hh:mm:ss'T'a");
String[]arrValues = time.split("T");
if(arrValues.length>0) {
String strValue= arrValues[0];
String []arrTimeValues = strValue.split(":");
String strValue1= arrTimeValues[2];
setTimertext(strValue1);
}
}
public void setTimertext(String strValue) {
runOnUiThread(new Runnable() {
public void run() {
FinalTime=timer_time--;
btnTimer.setText(String.valueOf(FinalTime));
}
});
}
}
答案 1 :(得分:3)
Thread.sleep(3000);
绝对是个问题。您不能阻止UI线程,这正是sleep
所做的。您必须执行代码才能在runOnUiThread
内更新用户界面。
答案 2 :(得分:2)
package com.android.examples;
import java.util.Calendar;
import android.app.Activity;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.TextView;
public class CounterInRealTimeExampleActivity extends Activity {
private TextView textView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
LinearLayout layout = new LinearLayout(this);
textView = new TextView(this);
layout.addView(textView);
setContentView(layout);
new Thread(new Runnable() {
@Override
public void run() {
while (true) {
updateTime();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}).start();
}
private void updateTime() {
runOnUiThread(new Runnable() {
@Override
public void run() {
textView.setText(Integer.toString((int) (Calendar.getInstance()
.getTimeInMillis() / 1000) % 60));
}
});
}
}