SeekBar 在另一个里面 class

Question

我创建了一个显示距离的 SeekBar。此距离用于显示以特定距离为半径的圆。

在我的 onCreate 中有以下几行：

SeekBar seekBar = findViewById(R.id.sb_radius);
seekBar.setOnSeekBarChangeListener(seekBarChangeListener);

那么，我使用的class如下：

   private void Search_Map(float dpWidth, float dpHeight, Object Lat, Object Lon) {

    SeekBar.OnSeekBarChangeListener seekBarChangeListener = new SeekBar.OnSeekBarChangeListener() {

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
            // updated continuously as the user slides the thumb
            tvDistance.setText( "Progress: " + progress );
            Show_Map(dpWidth, dpHeight, Lat, Lon, progress*1000);
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
            // called when the user first touches the SeekBar
        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
            // called after the user finishes moving the SeekBar
        }
    };
}

我的问题是它从不执行任何操作，因为我在 onCreate 中收到错误消息：

cannot resolve symbol seekBarChangeListener.

如何在我的 class 中使用搜索栏并使侦听器正常工作？

谢谢

Answer 1

从 onCreate 中删除 seekBar.setOnSeekBarChangeListener(seekBarChangeListener); 行并将其添加到 Search_Map

的末尾

class ClassName{
Seekerbar seekerbar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout_name);
        seekBar = findViewById(R.id.sb_radius);

}
private void Search_Map(float dpWidth, float dpHeight, Object Lat, Object Lon) {

    SeekBar.OnSeekBarChangeListener seekBarChangeListener = new SeekBar.OnSeekBarChangeListener() {

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
            // updated continuously as the user slides the thumb
            tvDistance.setText( "Progress: " + progress );
            Show_Map(dpWidth, dpHeight, Lat, Lon, progress*1000);
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {
            // called when the user first touches the SeekBar
        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {
            // called after the user finishes moving the SeekBar
        }
    };
    seekBar.setOnSeekBarChangeListener(seekBarChangeListener);

} 
}

SeekBar 在另一个里面 class

SeekBar inside another class

android

android-seekbar