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android 自定义view实现彩虹进度条功能

  更新时间:2024年06月21日 10:20:21  作者:cyy298 
实现一个彩虹色进度条功能,不说明具体用途大家应该能猜到,想找别人造的轮子,但是没有合适的,所以决定自己实现一个,下面小编通过实例代码给大家分享android 自定义view实现彩虹进度条功能,感兴趣的朋友一起看看吧

实现一个彩虹色进度条功能,不说明具体用途大家应该能猜到。想找别人造的轮子,但是没有合适的,所以决定自己实现一个。

相关知识

android 自定义view

LinearGradient 线性渐变

实现步骤

自定义view

自定义一个TmcView类继承View

重写两个构造方法。构造方法一共有4个,这里边重写两个

重写ongSizeChanged方法,用来获取控件宽、高,来计算内部组件尺寸。

重写onDraw方法,里边要描画背景drawBackground,分段数据drawSection,和seekbar图片drawImage。

import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
import java.util.List;
public class TmcView extends View {
public TmcView(Context context) {
super(context);
}
public TmcView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawBackground(canvas);
drawSection(canvas);
drawImage(canvas);
}
/**
* 画背景
* @param canvas 画布
*/
private void drawBackground(Canvas canvas) {
}
/**
* 画分段数据
* @param canvas 画布
*/
private void drawSection(Canvas canvas) {
}
/**
* 画图片
* @param canvas 画布
*/
private void drawImage(Canvas canvas) {
}
/**
* 更新view
* @param total 总长度
* @param rest 剩余长度
* @param sections 分段数据
*/
public void updateView(int total, int rest, List<SectionData> sections){
}

实现几个重构方法

标注:

整体宽度为图片宽度44px

背景条宽度30px,外边距7px,圆角15px

带颜色的条宽度20xp,外边距5px,圆角15px

自定义view的坐标轴是以view的左上角位置为原点,向右为x轴正方向,向下为y轴正方向

在视图中用RectF创建背景,和颜色条,并在onSizeChanged中设置尺寸

public class TmcView extends View {
private final RectF backgroundRectF = new RectF();
private final RectF colorRectF = new RectF();
public TmcView(Context context) {
super(context);
}
public TmcView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
//设置矩形 left top right bottom 左上右下点的值 按照标注计算得出
backgroundRectF.set(7, 0, 37, h);
colorRectF.set(12, 5, 32, h-5);
}
...
}

绘制背景条

实现drawBackground方法,画背景需要一根画笔Paint 为了避免重复创建,声明为成员变量

public class TmcView extends View {
/*背景画笔*/
private final Paint backPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private final RectF backgroundRectF = new RectF();
private final RectF colorRectF = new RectF();
public TmcView(Context context) {
super(context);
}
public TmcView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
//设置矩形 left top right bottom 左上右下点的值 按照标注计算得出
backgroundRectF.set(7, 0, 37, h);
colorRectF.set(12, 5, 32, h-5);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawBackground(canvas);
drawSection(canvas);
drawImage(canvas);
}
/**
* 画背景
* @param canvas 画布
*/
private void drawBackground(Canvas canvas) {
backPaint.setStyle(Paint.Style.FILL);
backPaint.setAntiAlias(true); //抗锯齿
backPaint.setColor(Color.parseColor("#FFFFFF"));
//画圆角矩形,15为圆角的角度
canvas.drawRoundRect(backgroundRectF, 15, 15, backPaint);
}
...
}

  布局中加入TmcView

<com.bigxuan.tesapp.view.TmcView
android:id="@+id/tmc"
android:layout_width="44px"
android:layout_height="690px"
android:layout_marginEnd="1230px"
android:layout_marginBottom="100px"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
/>

绘制颜色条

实现drawSection方法,这里要用到线性渐变LinearGradient

LinearGradient 简单说,指定每一段的颜色和位置百分比,就能实现每一段显示不同颜色。

但它默认是渐变色,要想不变就在每一段的开始和结束位置都设置相同的颜色。

再创建一个画笔 Paint,画颜色条

public class TmcView extends View {
private final Paint backPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private final Paint colorPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private final RectF backgroundRectF = new RectF();
private final RectF colorRectF = new RectF();
public TmcView(Context context) {
super(context);
}
public TmcView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
//设置矩形 left top right bottom 左上右下点的值 按照标注计算得出
backgroundRectF.set(7, 0, 37, h);
colorRectF.set(12, 5, 32, h-5);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawBackground(canvas);
drawSection(canvas);
drawImage(canvas);
}
/**
* 画背景
* @param canvas 画布
*/
private void drawBackground(Canvas canvas) {
backPaint.setStyle(Paint.Style.FILL);
backPaint.setAntiAlias(true); //抗锯齿
backPaint.setColor(Color.parseColor("#FFFFFF"));
//画圆角矩形,15为圆角的角度
canvas.drawRoundRect(backgroundRectF, 15, 15, backPaint);
}
/**
* 画分段数据
* @param canvas 画布
*/
private void drawSection(Canvas canvas) {
int[] colorArray = {
Color.parseColor("#FF0000"), Color.parseColor("#FF0000"),
Color.parseColor("#00FF00"), Color.parseColor("#00FF00"),
Color.parseColor("#0000FF"), Color.parseColor("#0000FF")
};
float[] positionArray = {
0f, 0.2f,
0.2f, 0.6f,
0.6f, 1f
};
colorPaint.setStyle(Paint.Style.FILL);
colorPaint.setAntiAlias(true);
//指定渐变色方向x轴方向不变,沿y方向渐变,渐变范围为 颜色条高度
colorPaint.setShader(new LinearGradient(0, 0, 0, colorRectF.bottom, colorArray, positionArray, Shader.TileMode.REPEAT));
canvas.drawRoundRect(colorRectF,15, 15, colorPaint);
}
...
}

绘制进度图片

app加入图片资源,根据资源id获取bitmap对象,绘制。

需要注意的是,坐标轴的顶点在左上角,绘制图片时也是以图片左上顶点位置做定位,图片位置是view的高度减掉图片的高度,才能显示在正确位置。

public class TmcView extends View {
private Context context;
private final Paint backPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private final Paint colorPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private final RectF backgroundRectF = new RectF();
private final RectF colorRectF = new RectF();
/*图片资源id*/
private int imgResId;
/*图片位置*/
private int imgPos;
public TmcView(Context context) {
super(context);
}
public TmcView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
this.context = context;
this.imgResId = R.drawable.icon_seekbar_day;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
//设置矩形 left top right bottom 左上右下点的值 按照标注计算得出
backgroundRectF.set(7, 0, 37, h);
colorRectF.set(12, 5, 32, h-5);
imgPos = h - 44; // 设置一个初始位置
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawBackground(canvas);
drawSection(canvas);
drawImage(canvas);
}
/**
* 画背景
* @param canvas 画布
*/
private void drawBackground(Canvas canvas) {
backPaint.setStyle(Paint.Style.FILL);
backPaint.setAntiAlias(true); //抗锯齿
backPaint.setColor(Color.parseColor("#FFFFFF"));
//画圆角矩形,15为圆角的角度
canvas.drawRoundRect(backgroundRectF, 15, 15, backPaint);
}
/**
* 画分段数据
* @param canvas 画布
*/
private void drawSection(Canvas canvas) {
int[] colorArray = {
Color.parseColor("#FF0000"), Color.parseColor("#FF0000"),
Color.parseColor("#00FF00"), Color.parseColor("#00FF00"),
Color.parseColor("#0000FF"), Color.parseColor("#0000FF")
};
float[] positionArray = {
0f, 0.2f,
0.2f, 0.6f,
0.6f, 1f
};
colorPaint.setStyle(Paint.Style.FILL);
colorPaint.setAntiAlias(true);
//指定渐变色方向x轴方向不变,沿y方向渐变,渐变范围为 颜色条高度
colorPaint.setShader(new LinearGradient(0, 0, 0, colorRectF.bottom, colorArray, positionArray, Shader.TileMode.REPEAT));
canvas.drawRoundRect(colorRectF,15, 15, colorPaint);
}
/**
* 画图片
* @param canvas 画布
*/
private void drawImage(Canvas canvas) {
Bitmap bitmap = initBitmap(imgResId);
canvas.save();
canvas.translate(0, 0);
canvas.drawBitmap(bitmap, 0, imgPos, null);
canvas.restore();
}
/**
* 通过资源id 创建bitmap
* @param resId 资源id
* @return
*/
private Bitmap initBitmap(int resId) {
Bitmap originalBmp = BitmapFactory.decodeResource(context.getResources(), resId);
return Bitmap.createScaledBitmap(originalBmp, 44, 44, true);
}
...
}

公共方法

暴露方法用来更新进度updateView

定义一个图片有效的运动距离为view高度减掉图片高度,函数参数为总距离和剩余距离,计算百分比后乘以有效运动距离得出图片描画位置。最后调用invalidate方法刷新view

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.util.AttributeSet;
import android.view.View;
import androidx.annotation.Nullable;
import com.navinfo.tesapp.R;
import java.util.List;
public class TmcView extends View {
private Context context;
private final Paint backPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private final Paint colorPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private final RectF backgroundRectF = new RectF();
private final RectF colorRectF = new RectF();
/*图片资源id*/
private int imgResId;
/*图片位置*/
private int imgPos;
/*图片有效的运动距离*/
private int imgValidHeight;
public TmcView(Context context) {
super(context);
}
public TmcView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
this.context = context;
this.imgResId = R.drawable.icon_seekbar_day;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
//设置矩形 left top right bottom 左上右下点的值 按照标注计算得出
backgroundRectF.set(7, 0, 37, h);
colorRectF.set(12, 5, 32, h-5);
imgValidHeight = h - 44;
imgPos = h - 44; // 设置一个初始位置
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawBackground(canvas);
drawSection(canvas);
drawImage(canvas);
}
/**
* 画背景
* @param canvas 画布
*/
private void drawBackground(Canvas canvas) {
backPaint.setStyle(Paint.Style.FILL);
backPaint.setAntiAlias(true); //抗锯齿
backPaint.setColor(Color.parseColor("#FFFFFF"));
//画圆角矩形,15为圆角的角度
canvas.drawRoundRect(backgroundRectF, 15, 15, backPaint);
}
/**
* 画分段数据
* @param canvas 画布
*/
private void drawSection(Canvas canvas) {
int[] colorArray = {
Color.parseColor("#FF0000"), Color.parseColor("#FF0000"),
Color.parseColor("#00FF00"), Color.parseColor("#00FF00"),
Color.parseColor("#0000FF"), Color.parseColor("#0000FF")
};
float[] positionArray = {
0f, 0.2f,
0.2f, 0.6f,
0.6f, 1f
};
colorPaint.setStyle(Paint.Style.FILL);
colorPaint.setAntiAlias(true);
//指定渐变色方向x轴方向不变,沿y方向渐变,渐变范围为 颜色条高度
colorPaint.setShader(new LinearGradient(0, 0, 0, colorRectF.bottom, colorArray, positionArray, Shader.TileMode.REPEAT));
canvas.drawRoundRect(colorRectF,15, 15, colorPaint);
}
/**
* 画图片
* @param canvas 画布
*/
private void drawImage(Canvas canvas) {
Bitmap bitmap = initBitmap(imgResId);
canvas.save();
canvas.translate(0, 0);
canvas.drawBitmap(bitmap, 0, imgPos, null);
canvas.restore();
}
/**
*
* @param resId
* @return
*/
private Bitmap initBitmap(int resId) {
Bitmap originalBmp = BitmapFactory.decodeResource(context.getResources(), resId);
return Bitmap.createScaledBitmap(originalBmp, 44, 44, true);
}
/**
* 更新view
* @param total 总长度
* @param rest 剩余长度
* @param sections 分段数据
*/
public void updateView(int total, int rest, List<SectionData> sections){
float percent = (1f * rest) / total;
//防止溢出
if(percent < 0){
return;
}
imgPos = (int)(percent * imgValidHeight);
invalidate();
}
}

updateView方法还有第三个参数,是用来传出颜色条不同段的颜色和百分比数据的。根据此数据来更新颜色条。这里需要根据业务不同自己实现,我这里就不写了。

总结

        大家可能看出来了,这个视图是用来展示导航中不同路段交通情况和当前车辆进度用的。自定义view中可以在构造方法中获取一些自定义属性,像背景条和颜色条的边距、圆角这些都可以定义到xml中,因为只适配一种屏幕尺寸所以也没有做多尺寸适配。以前也没有做过,这次记录下来。

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