Question

我在BottomNavigationView的片段之一中使用了Chronometer 计时码表工作正常，但是当我选择另一个片段时，它会从00:00重新开始

如果我选择另一个片段并返回timer_fragment并且计时器显示继续时间，是否仍然存在？

Timer_Frag

private Runnable runnable = new Runnable() {
        public void run() {
            //
            // Do the stuff

            if (!resume) {
                cmTimer.setBase(SystemClock.elapsedRealtime());
                cmTimer.start();
            } else {
                cmTimer.start();
            }
            //


            cmTimer.setOnChronometerTickListener(new Chronometer.OnChronometerTickListener()
            {
                @Override
                public void onChronometerTick(Chronometer chronometer)
                {
                    try
                    {

                        if(!resume){
                            long minutes = ((SystemClock.elapsedRealtime() - cmTimer.getBase())/1000) / 60;
                            long seconds = ((SystemClock.elapsedRealtime() - cmTimer.getBase())/1000) % 60;
                            elapsedTime = SystemClock.elapsedRealtime();
                            Log.d(TAG, "onChronometerTick: " + minutes + " : " + seconds);
                        }
                        else {
                            long minutes = ((elapsedTime - cmTimer.getBase())/1000) / 60;
                            long seconds = ((elapsedTime - cmTimer.getBase())/1000) % 60;
                            elapsedTime = elapsedTime + 1000;
                            Log.d(TAG, "onChronometerTick: " + minutes + " : " + seconds);
                        }

                    }catch (Exception e)
                    {
                        e.printStackTrace();
                    }

                }
            });

           // handler.postDelayed(this, 1000);
        }
    };
@OnClick(R.id.btnstart)
    void startTimer(){
        btnStart.setEnabled(false);

        runnable.run();

    }

谢谢... !!!

Answer 1

这是科特林的一个例子。

    class HomeActivity : AppCompatActivity() {


    private var mFragment1: Fragment1? = null
    private var mFragment2: Fragment2? = null

    .
    .
    .


    private fun initialize() {


        bottomNavigationView.setOnNavigationItemSelectedListener {
            when (it.itemId) {
                R.id.navigation_fragment_1 -> {

                    if (mFragment1 == null) {
                        mFragment1 = Fragment1.newInstance()
                        addFragment(mFragment1, R.id.frameLayout, false)
                    } else {
                        showFragment(mFragment1)
                        hideFragment(mFragment2)

                    }


                }

                R.id.navigation_fragment_1 -> {
                    if (mFragment2 == null) {
                        mFragment2 = Fragment2.newInstance()
                        addFragment(mFragment2, R.id.frameLayout, false)
                    } else {
                        hideFragment(mFragment1)
                        showFragment(mFragment2)
                    }

                }


            }

            true
        }

        mFragment1 = Fragment1.newInstance()
        addFragment(mFragment1, R.id.frameLayout, false)
    }

}

fun AppCompatActivity.hideFragment(fragment: Fragment?) {
    if (fragment != null)
        supportFragmentManager.beginTransaction()
                .hide(fragment)
                .commit()
}

fun AppCompatActivity.showFragment(fragment: Fragment?) {
    if (fragment != null)
        supportFragmentManager.beginTransaction()
                .show(fragment)
                .commit()
}

在BottomNavigationView中使用天文钟

1 个答案: