Day10 滑动条与进度条

1.滑动条

image.png

1.xml配置

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="0dp"
        app:layout_constraintBottom_toTopOf="@id/operation"

        app:layout_constraintTop_toTopOf="parent"
        android:orientation="horizontal"
        >
        <!--滑动条-->

        <SeekBar

            android:layout_width="match_parent"
            android:layout_height="50dp"

            android:progressTint="#000"
            android:progressBackgroundTint="#f00"
            android:thumbTint="#fff"
            android:max="100"
            />
   <LinearLayout
        android:id="@+id/operation"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        app:layout_constraintBottom_toBottomOf="parent"
        android:background="#f00"
        >
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

2.MainActivity

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    @Override
    protected void onResume() {
        super.onResume();
        //设置横竖屏
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR);
    }

}

3.Slider

public class Slider extends View {
 private int lineSize = 6; //线条的粗细
    private int lineColor = Color.BLACK;//默认线条颜色
    private Paint linePaint;
 public Slider(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init(){
        //背景线
        linePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        linePaint.setColor(lineColor);
        linePaint.setStrokeWidth(lineSize);
   @Override
    protected void onDraw(Canvas canvas) {

        if (getWidth() > getHeight()){
            //横着
            //画背景条
            canvas.drawLine(0,
                    getHeight()/2,
                    getWidth(),
                    getHeight()/2,
                    linePaint);
}else{
            //竖着
            canvas.drawLine(getWidth()/2,
                    0,
                    getWidth()/2,
                    getHeight(),
                    linePaint);
}

2.进度条

image.png

1.xml配置

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="0dp"
        app:layout_constraintBottom_toTopOf="@id/operation"

        app:layout_constraintTop_toTopOf="parent"
        android:orientation="horizontal"
        >
  <LinearLayout
        android:id="@+id/operation"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        app:layout_constraintBottom_toBottomOf="parent"
        android:background="#f00"
        >
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

2..MainActivity

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    
        final Slider slider=findViewById(R.id.slider);
        slider.setMax(100);
        slider.setStyle(Slider.SLIDER);
   
        new Timer().schedule(new TimerTask() {
            @Override
            public void run() {
                slider.setProgress((float) (slider.getProgress()+0.01));
            }
        },0,100);

        slider.setOnSliderChangeListener(new Slider.OnSliderChangeListener() {
            @Override
            public void progressChanged(float progress) {

            }
        });
        
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
    }

    /**
     * 自定义滑动条Slider
     * 进度条;没有thumb小圆点 不接受触摸事件
     * 滑动条：有thumb小圆点 接受触摸事件
     *      1.当有触摸的时候小圆点放大
     *      2.监听滑动事件
     * 横竖切换;width>height 横着     width<height竖着
     */
    @Override
    protected void onStart() {
        super.onStart();
    }

    @Override
    protected void onResume() {
        super.onResume();
        //设置横竖屏
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR);
    }

3.Slider

public class Slider extends View {
    private int lineSize = 6; //线条的粗细
    private int lineColor = Color.BLACK;//默认线条颜色
    private Paint linePaint;

    private Paint circlePaint; //小圆点的画笔
    private int thumbColor = Color.MAGENTA; //小圆点的颜色
    private int cx; //中心点x
    private int cy; //中心点y
    private int radius; //小圆点半径

    private int thumbScale = 4; //小圆点缩放尺寸基数
    private float position; //记录触摸点的坐标

    private Paint progressPaint; //进度条进度的画笔
    private int progressColor = Color.MAGENTA;//颜色

    public static int PROGRESS=0;//进度条
    public static int SLIDER=1;//滑动条
    private int style=PROGRESS;//样式

    public int max=100; //最大值
    public float progress;//进度值
    //滑动改变的监听者
   private OnSliderChangeListener onSliderChangeListener;


    public Slider(Context context) {
        super(context);
    }

    public Slider(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init(){
        //背景线
        linePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        linePaint.setColor(lineColor);
        linePaint.setStrokeWidth(lineSize);

        //小圆点
        circlePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        circlePaint.setColor(thumbColor);
        circlePaint.setStyle(Paint.Style.FILL);

        //进图条
        progressPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        progressPaint.setColor(progressColor);
        progressPaint.setStrokeWidth(lineSize);
    }

    @Override
    protected void onDraw(Canvas canvas) {

        if (getWidth() > getHeight()){
            //横着
            //画背景条
            canvas.drawLine(0,
                    getHeight()/2,
                    getWidth(),
                    getHeight()/2,
                    linePaint);

            if (position > 0) {
                //画进度条
                canvas.drawLine(0,
                        getHeight() / 2,
                        position,
                        getHeight() / 2,
                        progressPaint);
            }

            radius = getHeight()/thumbScale;
            cy = getHeight()/2;

            //确定cx的值
            if (position < radius){
                cx = radius;
            }else if (position > getWidth()-radius){
                cx = getWidth()-radius;
            }else{
                cx = (int) position;
            }

        }else{
            //竖着
            canvas.drawLine(getWidth()/2,
                    0,
                    getWidth()/2,
                    getHeight(),
                    linePaint);

            if (position > 0){
                canvas.drawLine(getWidth()/2,
                        0,
                        getWidth()/2,
                        position,
                        progressPaint);
            }

            radius = getWidth()/thumbScale;
            cx = getWidth()/2;

            //确定中心点cy的值
            if (position < radius){
                cy = radius;
            }else if(position > getHeight()-radius){
                cy = getHeight()-radius;
            }else{
                cy = (int) position;
            }

        }

        //画小圆点
        if(style==SLIDER){
            canvas.drawCircle(cx,cy,radius,circlePaint);
        }

    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()){
            case MotionEvent.ACTION_DOWN:
                //小圆点放大
                thumbScale = 2;
                if (getWidth() > getHeight()){
                    //横向时 y不变 x改变
                    position = event.getX();
                }else{
                    //竖着时 x不变 y改变
                    position = event.getY();
                }
                callback();
                break;
            case MotionEvent.ACTION_MOVE:
                //获取当前触摸点的值 X Y
                if (getWidth() > getHeight()){
                    //横向时 y不变 x改变
                    position = event.getX();
                    if(position<0){
                        position=0;
                    }else if(position>getWidth()){
                        position=getWidth();
                    }
                }else{
                    //竖着时 x不变 y改变
                    position = event.getY();
                    if(position<0){
                        position=0;
                    }else if(position>getWidth()){
                        position=getHeight();
                    }
                }
                callback();
                break;

            case MotionEvent.ACTION_UP:
                thumbScale = 4;
                break;
        }
        if(style==SLIDER){
            invalidate();
        }

        return true;
    }

    public int getStyle() {
        return style;
    }

    public void setStyle(int style) {
        this.style = style;
    }
    public float getProgress() {
        return progress;
    }

    public void setProgress(float progress) {
        this.progress = progress;

        if(progress< 0.001){
        //将进度条 转化为控件中的尺寸位置

        if(getWidth()>getHeight()){
            position=progress*getWidth();
        }else{
            position=progress*getHeight();
        }
        invalidate();
    }
    }
    public void setMax(int max){
        this .max=max;
    }
    public interface OnSliderChangeListener{
        //通过这个方法回调数据
        void progressChanged(float progress);
    }

    private void callback(){
        if(onSliderChangeListener!=null){
            if(getWidth()>getHeight()){
                progress= position/getWidth() ;
            }else{
                progress=position/getHeight();
            }

            onSliderChangeListener.progressChanged(progress*max);
        }
    }
    public void setOnSliderChangeListener(OnSliderChangeListener onSliderChangeListener) {
        this.onSliderChangeListener = onSliderChangeListener;

    }
}

3.心得体会

学习了进度条与滑动条的代码书写，为画板demo做下准备

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