android横向刻度尺代码

以下是一个简单的实现 Android 横向刻度尺的示例代码：

1. 首先，在布局文件中添加一个水平方向的 SeekBar，并将其隐藏起来：

<SeekBar
    android:id="@+id/seekbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:visibility="invisible" />

2. 在代码中，设置 SeekBar 的最大值、最小值和当前值，并添加一个 OnSeekBarChangeListener 来监听 SeekBar 的变化：

SeekBar seekBar = findViewById(R.id.seekbar);
seekBar.setMax(100);
seekBar.setMin(0);
seekBar.setProgress(50);

seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        // 当 SeekBar 的值发生变化时，更新刻度尺的显示
        updateScale(progress);
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
        // 当开始拖动 SeekBar 时，暂停更新刻度尺的显示
        stopUpdateScale();
    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        // 当停止拖动 SeekBar 时，恢复更新刻度尺的显示
        startUpdateScale();
    }
});

3. 在 updateScale 方法中更新刻度尺的显示，例如使用一个横向的 LinearLayout 来显示刻度尺：

private void updateScale(int progress) {
    LinearLayout scale = findViewById(R.id.scale);

    // 清空原有的刻度
    scale.removeAllViews();

    // 添加新的刻度
    for (int i = 0; i <= 100; i += 10) {
        TextView textView = new TextView(this);
        textView.setText(String.valueOf(i));
        textView.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 12);

        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT,
                LinearLayout.LayoutParams.WRAP_CONTENT);
        layoutParams.weight = 1;
        textView.setLayoutParams(layoutParams);

        if (i == progress) {
            textView.setTextColor(Color.RED);
        }

        scale.addView(textView);
    }
}

4. 在 startUpdateScale 方法中启动一个定时器来更新刻度尺的显示：

private void startUpdateScale() {
    final Handler handler = new Handler();
    final Runnable runnable = new Runnable() {
        @Override
        public void run() {
            updateScale(seekBar.getProgress());
            handler.postDelayed(this, 1000);
        }
    };
    handler.postDelayed(runnable, 1000);
}

5. 在 stopUpdateScale 方法中停止定时器：

private void stopUpdateScale() {
    handler.removeCallbacksAndMessages(null);
}

完整的示例代码如下：

public class MainActivity extends AppCompatActivity {

    private SeekBar seekBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        seekBar = findViewById(R.id.seekbar);
        seekBar.setMax(100);
        seekBar.setMin(0);
        seekBar.setProgress(50);

        seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                updateScale(progress);
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                stopUpdateScale();
            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                startUpdateScale();
            }
        });

        startUpdateScale();
    }

    private void updateScale(int progress) {
        LinearLayout scale = findViewById(R.id.scale);
        scale.removeAllViews();

        for (int i = 0; i <= 100; i += 10) {
            TextView textView = new TextView(this);
            textView.setText(String.valueOf(i));
            textView.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 12);

            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                    LinearLayout.LayoutParams.WRAP_CONTENT,
                    LinearLayout.LayoutParams.WRAP_CONTENT);
            layoutParams.weight = 1;
            textView.setLayoutParams(layoutParams);

            if (i == progress) {
                textView.setTextColor(Color.RED);
            }

            scale.addView(textView);
        }
    }

    private void startUpdateScale() {
        final Handler handler = new Handler();
        final Runnable runnable = new Runnable() {
            @Override
            public void run() {
                updateScale(seekBar.getProgress());
                handler.postDelayed(this, 1000);
            }
        };
        handler.postDelayed(runnable, 1000);
    }

    private void stopUpdateScale() {
        handler.removeCallbacksAndMessages(null);
    }
}