使用SeekBar控件来控制
布局文件:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<!-- 拖拽实现控制屏幕亮度-->
<SeekBar
android:id="@+id/brightness_bar"
android:layout_width="400dp"
android:layout_height="wrap_content"
/>
</LinearLayout>
Activity代码
1.设置SeekBar控件
SeekBar bar = (SeekBar) findViewById(R.id.brightness_bar);
bar.setOnSeekBarChangeListener(this);
2.继承 SeekBar.OnSeekBarChangeListener 接口
实现三个方法
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
int id = seekBar.getId();
Window window = getWindow();
switch (id){
//调整屏幕的亮度
case R.id.brightness_bar:
WindowManager.LayoutParams attributes = window.getAttributes();
attributes.screenBrightness = (float) (progress * 0.01);
window.setAttributes(attributes);
break;
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}