如何从 OnCreate 方法外部更改小部件的可见性？Java 安卓工作室

Question

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

但是，我收到错误“无法解析符号'视图'”。而且“无法解析符号'seekBarTimeToPlay'。” 但似乎通过SeekBar seekBarTimeToPlay = (SeekBar) findViewById(R.id.seekBarTimeToPlay);在方法中添加另一个来解决这个问题。

    //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);

            } 

        }

    });

}

如何从另一种方法更改可见性？我也不能使用static我不明白的。

Answer 1

视图应该从大写开始，因为它是类名：seekBarTimeToPlay.setVisibility(View.GONE);或者seekBarTimeToPlay.setVisibility(View.VISIBLE);并记住导入：import android.view.View;