Question

我有一个类扩展countdowntimer

我想在onfinish（）中做一个祝酒词，每当从任何对象实例化的任何其他类调用onfinish（）函数时都会显示

我该怎么做？

package com.fawzyx.exams_countdowntimer;

import android.os.CountDownTimer;
import android.text.InputFilter.LengthFilter;
import android.widget.Toast;

public class CountDown extends CountDownTimer {

    public CountDown(long millisInFuture, long countDownInterval) {
        super(millisInFuture, countDownInterval);
/*
millisInFuture : The number of millis in the future from the call to start() until the countdown is done and onFinish() is called.
countDownInterval : The interval along the way to receive onTick(long) callbacks.

*/


    }

    @Override
    public void onFinish() {
        // TODO Auto-generated method stub

        Toast.makeText(getApplicationContext() ,"Done", Toast.LENGTH_LONG);

    }

    @Override
    public void onTick(long millisUntilFinished) {
        // TODO Auto-generated method stub

    }

}

Answer 1

您需要将上下文传递给CounteDown类

new CountDown(MyActivityName.this,otherparams);

现在使用传递的上下文来显示toast

Context context;
public CountDown(Context context,long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
this.context = context;
}

然后在onFinish()

Toast.makeText(context," Message", Toast.LENGTH_SHORT).show();

Answer 2

试试这个：

public class CountDown extends CountDownTimer {

    private Context context;

    public CountDown(Context context, long millisInFuture, long countDownInterval) {
        super(millisInFuture, countDownInterval);
        this.context = context;
    }
    @Override
    public void onFinish() {
        Toast.makeText(context ,"Done", Toast.LENGTH_LONG).show();

    }
}

Answer 3

两个问题：

您需要传递Context，例如作为构造函数arg：

private Context mContext;

public CountDown(Context context, long millisInFuture, long countDownInterval) {
    super(millisInFuture, countDownInterval);
    mContext = context;

将此mContext传递给Toast。

在Toast.makeText()之后，请致电show()进行实际展示。

Answer 4

像这样使用：

public class CountDown extends CountDownTimer {

   Context context;
    public CountDown(long millisInFuture, long countDownInterval , Context ctx) {
        super(millisInFuture, countDownInterval);

  this.context = ctx;

/*
millisInFuture : The number of millis in the future from the call to start() until the countdown is done and onFinish() is called.
countDownInterval : The interval along the way to receive onTick(long) callbacks.

*/
 }

    @Override
    public void onFinish() {
        // TODO Auto-generated method stub

        Toast.makeText(context ,"Done", Toast.LENGTH_LONG);

    }

    @Override
    public void onTick(long millisUntilFinished) {
        // TODO Auto-generated method stub

    }

}

在调用construtor上下文时调用其Activity，无论我们想要倒计时等级

Answer 5

更简单的方法是覆盖onStop并使用getApplicationContext()。然后在活动结束时出现吐司。

@Override
protected void onStop() {
    super.onStop();
    Toast toast = Toast.makeText(getApplicationContext(),"Toast message here",Toast.LENGTH_SHORT);
    toast.show();
}

在一项活动中敬酒并在另一项活动中展示

5 个答案: