我有两个XML的edittext。在一个EditText中，用户可以将一个数字作为分钟，在另一个EditText中，将一个数字作为秒。单击finish按钮后，秒EditText应该开始倒计时，并每秒钟更新一次文本。
此外，我如何才能保持它的更新，直到它达到零分零秒?
当前回答
只需复制粘贴以下代码........
MainActivity
包com.example.countdowntimer;
import java.util.concurrent.TimeUnit;
import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView text1;
private static final String FORMAT = "%02d:%02d:%02d";
int seconds , minutes;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text1=(TextView)findViewById(R.id.textView1);
new CountDownTimer(16069000, 1000) { // adjust the milli seconds here
public void onTick(long millisUntilFinished) {
text1.setText(""+String.format(FORMAT,
TimeUnit.MILLISECONDS.toHours(millisUntilFinished),
TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished) - TimeUnit.HOURS.toMinutes(
TimeUnit.MILLISECONDS.toHours(millisUntilFinished)),
TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) - TimeUnit.MINUTES.toSeconds(
TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished))));
}
public void onFinish() {
text1.setText("done!");
}
}.start();
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="34dp"
android:layout_marginTop="58dp"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>
其他回答
// the count down timer
new CountDownTimer(30000, 1000)
{
@Override
public void onTick(long l) {
}
@Override
public void onFinish() {
//on finish the count down timer finsih
}
}
}
}.start();
只需复制粘贴以下代码........
MainActivity
包com.example.countdowntimer;
import java.util.concurrent.TimeUnit;
import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView text1;
private static final String FORMAT = "%02d:%02d:%02d";
int seconds , minutes;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text1=(TextView)findViewById(R.id.textView1);
new CountDownTimer(16069000, 1000) { // adjust the milli seconds here
public void onTick(long millisUntilFinished) {
text1.setText(""+String.format(FORMAT,
TimeUnit.MILLISECONDS.toHours(millisUntilFinished),
TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished) - TimeUnit.HOURS.toMinutes(
TimeUnit.MILLISECONDS.toHours(millisUntilFinished)),
TimeUnit.MILLISECONDS.toSeconds(millisUntilFinished) - TimeUnit.MINUTES.toSeconds(
TimeUnit.MILLISECONDS.toMinutes(millisUntilFinished))));
}
public void onFinish() {
text1.setText("done!");
}
}.start();
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="34dp"
android:layout_marginTop="58dp"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceMedium" />
</RelativeLayout>
如果您使用以下代码(如已接受的答案所述)，
new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
//here you can have your logic to set text to edittext
}
public void onFinish() {
mTextField.setText("done!");
}
}.start();
如果不仔细清理引用，将导致使用此代码的活动实例的内存泄漏。
使用以下代码
//Declare timer
CountDownTimer cTimer = null;
//start timer function
void startTimer() {
cTimer = new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
}
};
cTimer.start();
}
//cancel timer
void cancelTimer() {
if(cTimer!=null)
cTimer.cancel();
}
你需要调用cTtimer.cancel()每当onDestroy()/onDestroyView()在拥有的活动/片段被调用。
public class Scan extends AppCompatActivity {
int minute;
long min;
TextView tv_timer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scan2);
tv_timer=findViewById(R.id.tv_timer);
minute=Integer.parseInt("Your time in string form like 10");
min= minute*60*1000;
counter(min);
}
private void counter(long min) {
CountDownTimer timer = new CountDownTimer(min, 1000) {
public void onTick(long millisUntilFinished) {
int seconds = (int) (millisUntilFinished / 1000) % 60;
int minutes = (int) ((millisUntilFinished / (1000 * 60)) % 60);
int hours = (int) ((millisUntilFinished / (1000 * 60 * 60)) % 24);
tv_timer.setText(String.format("%d:%d:%d", hours, minutes, seconds));
}
public void onFinish() {
Toast.makeText(getApplicationContext(), "Your time has been completed",
Toast.LENGTH_LONG).show();
}
};
timer.start();
}
}
倒转倒计时计时器与小时，分钟和秒
public void reverseTimer(int Seconds, final TextView tv) {
new CountDownTimer(Seconds * 1000 + 1000, 1000) {
public void onTick(long millisUntilFinished) {
int seconds = (int) (millisUntilFinished / 1000);
int hours = seconds / (60 * 60);
int tempMint = (seconds - (hours * 60 * 60));
int minutes = tempMint / 60;
seconds = tempMint - (minutes * 60);
tv.setText("TIME : " + String.format("%02d", hours)
+ ":" + String.format("%02d", minutes)
+ ":" + String.format("%02d", seconds));
}
public void onFinish() {
tv.setText("Completed");
}
}.start();
}
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