Android模拟汽车仪表盘

实现效果图如下所示：



主要代码如下：

/**
* 自定义一个View继承ImageView，增加一个通用的旋转图片资源的方法
* @author Johnny
*
*/
public class CompassView extends ImageView {
private float mDirection;// 方向旋转浮点数
private Drawable compass;// 图片资源

//三个构造器
public CompassView(Context context) {
super(context);
mDirection = 0.0f;// 默认不旋转
compass = null;
}

public CompassView(Context context, AttributeSet attrs) {
super(context, attrs);
mDirection = 0.0f;
compass = null;
}

public CompassView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mDirection = 0.0f;
compass = null;
}

@Override
protected void onDraw(Canvas canvas) {
if (compass == null) {
compass = getDrawable();// 获取当前view的图片资源
compass.setBounds(0, 0, getWidth(), getHeight());// 图片资源在view的位置，此处相当于充满view
}

canvas.save();
canvas.rotate(mDirection, getWidth() / 2, getHeight() / 2);// 绕图片中心点旋转，
compass.draw(canvas);// 把旋转后的图片画在view上，即保持旋转后的样子
canvas.restore();// 保存一下
}

/**
* 自定义更新方向的方法
*
* @param direction
* 传入的方向
*/
public void updateDirection(float direction) {
mDirection = direction;
postInvalidate();// 重新刷新一下，更新方向
}
}

/**
* @author Johnny
* 自定义进度视图类
*/
public class RoundProgressBar extends View {
/**
* 画笔对象的引用
*/
private Paint paint;

Shader mRadialGradient = null;
/**
* 圆环的颜色
*/
private int roundColor;
/**
* 圆环进度的颜色
*/
private int roundProgressColor;
/**
* 中间进度百分比的字符串的颜色
*/
private int textColor;
/**
* 中间进度百分比的字符串的字体
*/
private float textSize;
/**
* 圆环的宽度
*/
private float roundWidth;
/**
* 最大进度
*/
private int max;
/**
* 当前进度
*/
private int progress;
/**
* 是否显示中间的进度
*/
private boolean textIsDisplayable;
/**
* 进度的风格，实心或者空心
*/
private int style;

public static final int STROKE = 0;
public static final int FILL = 1;

public RoundProgressBar(Context context) {
this(context, null);
}

public RoundProgressBar(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}

public RoundProgressBar(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
paint = new Paint();
TypedArray mTypedArray = context.obtainStyledAttributes(attrs,R.styleable.RoundProgressBar);
//获取自定义属性和默认值
roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED);
roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN);
textColor = mTypedArray.getColor(R.styleable.RoundProgressBar_textColor, Color.GREEN);
textSize = mTypedArray.getDimension(R.styleable.RoundProgressBar_textSize, 15);
roundWidth = mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth, 5);
max = mTypedArray.getInteger(R.styleable.RoundProgressBar_max, 240);
textIsDisplayable = mTypedArray.getBoolean(R.styleable.RoundProgressBar_textIsDisplayable, true);
style = mTypedArray.getInt(R.styleable.RoundProgressBar_style, 0);
mTypedArray.recycle();
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);

/**
* 画最外层的大圆环
*/
int centre = getWidth()/2; //获取圆心的x坐标
int radius = (int) (centre - roundWidth/2); //圆环的半径
paint.setColor(roundColor); //设置圆环的颜色
paint.setStyle(Paint.Style.STROKE); //设置空心
paint.setStrokeWidth(roundWidth); //设置圆环的宽度
paint.setAntiAlias(true);  //消除锯齿

Log.e("log", centre + "");

/**
* 画进度百分比
*/
paint.setStrokeWidth(0);
paint.setColor(textColor);
paint.setTextSize(textSize);
paint.setTypeface(Typeface.DEFAULT_BOLD); //设置字体
//		int percent = (int)(((float)progress / (float)max) * 100);  //中间的进度百分比，先转换成float在进行除法运算，不然都为0
//		float textWidth = paint.measureText(percent + "%");   //测量字体宽度，我们需要根据字体的宽度设置在圆环中间
//
//		if(textIsDisplayable && percent != 0 && style == STROKE){
//			canvas.drawText(percent + "%", centre - textWidth / 2, centre + textSize/2, paint); //画出进度百分比
//		}
/**
* 画圆弧 ，画圆环的进度
*/
mRadialGradient = new SweepGradient(centre, centre,new int[] { Color.RED,
Color.DKGRAY, Color.GRAY, Color.LTGRAY, Color.MAGENTA,
Color.GREEN, Color.TRANSPARENT, Color.BLUE }, null);
paint.setShader(mRadialGradient);
//设置进度是实心还是空心
paint.setStrokeWidth(roundWidth); //设置圆环的宽度
paint.setColor(roundProgressColor);  //设置进度的颜色
RectF oval = new RectF(centre - radius, centre - radius, centre
+ radius, centre + radius);  //用于定义的圆弧的形状和大小的界限
style=STROKE;
switch (style) {
case STROKE:{
paint.setStyle(Paint.Style.STROKE);
canvas.drawArc(oval, -90, 360 * progress / max, false, paint);  //根据进度画圆弧
break;
}
case FILL:{
paint.setStyle(Paint.Style.FILL_AND_STROKE);
if(progress !=0)
canvas.drawArc(oval, 0, 360 * progress / max, true, paint);  //根据进度画圆弧
break;
}
}

}

public synchronized int getMax() {
return max;
}

/**
* 设置进度的最大值
* @param max
*/
public synchronized void setMax(int max) {
if(max < 0){
throw new IllegalArgumentException("max not less than 0");
}
this.max = max;
}

/**
* 获取进度.需要同步
* @return
*/
public synchronized int getProgress() {
return progress;
}

/**
* 设置进度，此为线程安全控件，由于考虑多线的问题，需要同步
* 刷新界面调用postInvalidate()能在非UI线程刷新
* @param progress
*/
public synchronized void setProgress(int progress) {
if(progress < 0){
throw new IllegalArgumentException("progress not less than 0");
}
if(progress > max){
progress = max;
}
if(progress <= max){
this.progress = progress;
postInvalidate();
}

}

public int getCricleColor() {
return roundColor;
}

public void setCricleColor(int cricleColor) {
this.roundColor = cricleColor;
}

public int getCricleProgressColor() {
return roundProgressColor;
}

public void setCricleProgressColor(int cricleProgressColor) {
this.roundProgressColor = cricleProgressColor;
}

public int getTextColor() {
return textColor;
}

public void setTextColor(int textColor) {
this.textColor = textColor;
}

public float getTextSize() {
return textSize;
}

public void setTextSize(float textSize) {
this.textSize = textSize;
}

public float getRoundWidth() {
return roundWidth;
}

public void setRoundWidth(float roundWidth) {
this.roundWidth = roundWidth;
}
}

public class MainActivity extends Activity{

private final float MAX_ROATE_DEGREE = 1.0f;// 最多旋转一周，即360°

private RoundProgressBar mRoundProgressBar1;
private int progress = 0;
private float mDirection;// 当前浮点方向
private float mTargetDirection;// 目标浮点方向
private CompassView mPointer;// 指南针view
private AccelerateInterpolator mInterpolator;// 动画从开始到结束，变化率是一个加速的过程,就是一个动画速率
private TextView TextViewSpd;

protected final Handler mHandler = new Handler(){

@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
switch(msg.what){
case 1:
obtainMessage(1);
int arg1=msg.arg1;
String spdShow=String.valueOf(arg1);
TextViewSpd.setText(spdShow);
break;
}
super.handleMessage(msg);
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cricle_progress);
mRoundProgressBar1 = (RoundProgressBar) findViewById(R.id.roundProgressBar1);
mPointer = (CompassView) findViewById(R.id.compass_pointer);// 自定义的指南针view
mInterpolator = new AccelerateInterpolator();// 实例化加速动画对象
mDirection = 0.0f;// 初始化起始方向
mTargetDirection = 0.0f;// 初始化目标方向
TextViewSpd=(TextView)findViewById(R.id.speed_show);
((Button)findViewById(R.id.button1)).setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
new Thread(new Runnable() {

@Override
public void run() {
while(true){
progress += 2;
if(progress>240){
progress=1;
}
mTargetDirection=progress*360/240;
if (mDirection != mTargetDirection) {

// calculate the short routine
float to = mTargetDirection;
if (to - mDirection > 180) {
to -= 360;
} else if (to - mDirection < -180) {
to += 360;
}

// limit the max speed to MAX_ROTATE_DEGREE
float distance = to - mDirection;
if (Math.abs(distance) > MAX_ROATE_DEGREE) {
distance = distance > 0 ? MAX_ROATE_DEGREE
: (-1.0f * MAX_ROATE_DEGREE);
}

// need to slow down if the distance is short
mDirection = normalizeDegree(mDirection
+ ((to - mDirection) ));
//								mDirection = normalizeDegree(mDirection+ ((to - mDirection) * mInterpolator
//								.getInte
a1e8
rpolation(Math.abs(distance) > MAX_ROATE_DEGREE ? 0.4f : 0.3f)));// 用了一个加速动画去旋转图片，很细致
mPointer.updateDirection(mDirection);// 更新指南针旋转
}
Message msg=new Message();
msg.what=1;
msg.arg1=progress;
mHandler.sendMessage(msg);
mRoundProgressBar1.setProgress(progress);
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}

}
}).start();
}
});

}

// 调整方向传感器获取的值
private float normalizeDegree(float degree) {
return (degree + 720) % 360;
}
}

源码下载链接