java - 如何从 OnCreate 方法外部更改小部件的可见性？ Java Android Studio

Question

我有一个搜索栏，我想在按下按钮时消失，并在倒计时后重新出现。我在倒计时后的 onFinish() 方法中使用了 seekBarTimeToPlay.setVisibility(view.INVISIBLE); 。

但是，我收到错误“无法解析符号“ View ””。并且“无法解析符号‘seekBarTimeToPlay’。”但似乎通过在方法内添加另一个 SeekBareekBarTimeToPlay = (SeekBar) findViewById(R.id.seekBarTimeToPlay); 来解决此问题。

    //change timeToPlay seekBar
    SeekBar seekBarTimeToPlay = (SeekBar) findViewById(R.id.seekBarTimeToPlay);
    //set progress/thumb pos to right place
    seekBarTimeToPlay.setProgress(timeToPlay);

    seekBarTimeToPlay.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
            timeToPlay = progress;
            updateTimeToPlay(timeToPlay, false);
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
           updateTimeToPlay(timeToPlay, true);
        }
    });

    //start playing, countdown
    final Button buttonMain = (Button) findViewById(R.id.buttonMain);
    buttonMain.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            //countdown, updating time to tidy text view, progress bar or clock animation

            SeekBar seekBarTimeToPlay = (SeekBar) findViewById(R.id.seekBarTimeToPlay);

            if (phase == "none") { //parent presses button, child starts playing
                phase = "playing";
                buttonMainText = "Pack Away Now";
                //hide seekBar, doesn't change layout
                seekBarTimeToPlay.setVisibility(View.INVISIBLE);
                startCountDown(timeToPlay);

            } else if (phase == "playing") {//parent presses button to pack away before time ended
                phase = "tidying";
                buttonMainText = "Confirm tidied up";
                countDownTimer.cancel(); //maybe error if countdown isn't running, if statement might solve
                updateTimeToPlay(timeToTidy, false);
                startCountDown(timeToTidy); //new 10 minute countdown to wait for conformation that toys are away
                //waiting to receive conformation, if received cancel countdown n that

            } else if (phase == "tidying") { //parent presses button confirming packed away
                countDownTimer.cancel(); //maybe error if countdown isn't running, if statement might solve
                phaseWasTidying();
            }

            buttonMain.setText(buttonMainText); //change text to whatever stage

            //returns here after button pressed
            seekBarTimeToPlay.setVisibility(View.VISIBLE); //make visible again
        }
    });
}

如何通过其他方法更改可见性？我也无法使用我不明白的 static 。

Answer 1

View 应该从大写开始，因为它是类名:

seekBarTimeToPlay.setVisibility(View.GONE);

或

seekBarTimeToPlay.setVisibility(View.VISIBLE);

<小时/>

并记住导入:

导入 android.view.View;