当我点击开始时,'秒表'开始计数..我按下暂停,只有textview暂停,它没有恢复,因为它仍然在后台运行..我需要它在我停止的地方恢复..
这是我的dot java代码:
package com.example.chronometer2;
import com.example.chronometer.R;
import android.app.Activity;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.widget.Button;
import android.widget.Chronometer;
public class ChronometerApp extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chronometer);
final Chronometer myChronometer = (Chronometer)findViewById(R.id.my_chronometer);
Button buttonStart = (Button)findViewById(R.id.buttonstart);
Button buttonStop = (Button)findViewById(R.id.buttonstop);
Button buttonReset = (Button)findViewById(R.id.buttonreset);
buttonStart.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
myChronometer.start();
}});
buttonStop.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
myChronometer.stop();
}});
buttonReset.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
myChronometer.setBase(SystemClock.elapsedRealtime());
}});
}
}
答案 0 :(得分:4)
您需要定义一个变量,其中包含计时器停止时的经过时间
timeWhenStopped = chronometer.getBase() - SystemClock.elapsedRealtime();
然后当你再次开始时设置定时器加上timeWhenStopped
chronometer.setBase(SystemClock.elapsedRealtime() + timeWhenStopped);
重置计时器只需使用
chronometer.setBase(SystemClock.elapsedRealtime());
chronometer.stop();
timeWhenStopped = 0;
也许您需要添加一个额外的变量来定义计时器是否正在运行
答案 1 :(得分:3)
你应该记住变化的时间,例如timeWhenStopped。然后,每当你开始计时器时,你的价值不是0,而是几秒钟?您可以通过方法setBase设置。这里有3个按钮,包括动作开始,暂停和重启。祝你好运!
public class MainActivity extends Activity {
/** Called when the activity is first created. */
long timeWhenStopped = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button butStart = (Button) findViewById(R.id.button1);
final Button butStop = (Button) findViewById(R.id.button2);
final Button butReset = (Button) findViewById(R.id.button3);
final Chronometer Mchronometer = (Chronometer) findViewById(R.id.chronometer1);
butStart.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) { Mchronometer.setBase(SystemClock.elapsedRealtime()
+timeWhenStopped);
Mchronometer.start();
}
});
butStop.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
timeWhenStopped = Mchronometer.getBase() - SystemClock.elapsedRealtime();
Mchronometer.stop();
}
});
butReset.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Mchronometer.setBase(SystemClock.elapsedRealtime());
Mchronometer.stop();
timeWhenStopped = 0;
}
});
}
答案 2 :(得分:1)
你需要一个跟踪时间的变量 自天文台开始以来已经过去了
答案 3 :(得分:1)
@ fabzy的代码有效,但算术逻辑没有,这可能会导致问题。
mTimeWhenStopped
应该是一个正数(计时器上经过的时间),但在fabzy的设置中,它总是负数。如果您将mTimeWhenStopped
数字用于运行计时器以外的任何其他内容(如比较,显示等),则会产生差异。
以下是与减法运算相反的相同代码。我还为计时器是否正在运行添加了一个可选的布尔值:
private void resumeTimer() {
mTimer.setBase(SystemClock.elapsedRealtime() - mTimeWhenStopped);
mTimer.start();
mTimerIsRunning = true;
}
private void stopTimer() {
mTimer.stop();
mTimeWhenStopped = SystemClock.elapsedRealtime() - mTimer.getBase();
mTimerIsRunning = false;
}
private void resetTimer() {
mTimer.stop();
mTimer.setBase(SystemClock.elapsedRealtime());
mTimeWhenStopped = 0;
mTimerIsRunning = false;
}
答案 4 :(得分:0)
我为此做了一个PauseableChronometer
课程。
import android.content.Context;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.widget.Chronometer;
public class PausableChronometer extends Chronometer {
private long timeWhenStopped = 0;
public PausableChronometer(Context context) {
super(context);
}
public PausableChronometer(Context context, AttributeSet attrs) {
super(context, attrs);
}
public PausableChronometer(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public void start() {
setBase(SystemClock.elapsedRealtime()+timeWhenStopped);
super.start();
}
@Override
public void stop() {
super.stop();
timeWhenStopped = getBase() - SystemClock.elapsedRealtime();
}
public void reset() {
stop();
setBase(SystemClock.elapsedRealtime());
timeWhenStopped = 0;
}
public long getCurrentTime() {
return timeWhenStopped;
}
public void setCurrentTime(long time) {
timeWhenStopped = time;
setBase(SystemClock.elapsedRealtime()+timeWhenStopped);
}
}