怎么在Android中通过自定义View实现一个炫酷的进度条？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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第一步：创建attrs文件夹，自定义属性：
第二步：自定义View：
/**
* Created by Michael on 2019/11/1.
*/
public class MyProgress extends View {
private int outColor;
private int innerColor;
private int textColor;
private float borderWidth;
private int textSize;
private Paint mOutPaint;
private Paint mInnerPaint;
private Paint mTextPaint;
private float percent;
private int p;
public MyProgress(Context context) {
this(context,null);
}
public MyProgress(Context context, @Nullable AttributeSet attrs) {
this(context, attrs,0);
}
public MyProgress(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
TypedArray array = context.obtainStyledAttributes(attrs,R.styleable.MyProgress);
outColor = array.getColor(R.styleable.MyProgress_out_color, Color.GREEN);
innerColor = array.getColor(R.styleable.MyProgress_inner_color, Color.BLUE);
textColor = array.getColor(R.styleable.MyProgress_text_color, Color.BLACK);
borderWidth = array.getDimension(R.styleable.MyProgress_border_width,10);
textSize = array.getDimensionPixelSize(R.styleable.MyProgress_text_size,20);
array.recycle();
init();
}
private void init() {
mOutPaint = new Paint();
mOutPaint.setAntiAlias(true);
mOutPaint.setDither(true);
mOutPaint.setStyle(Paint.Style.STROKE);
mOutPaint.setStrokeWidth(borderWidth);
mOutPaint.setColor(outColor);
mInnerPaint = new Paint();
mInnerPaint.setAntiAlias(true);
mInnerPaint.setDither(true);
mInnerPaint.setStyle(Paint.Style.STROKE);
mInnerPaint.setStrokeWidth(borderWidth);
mInnerPaint.setColor(innerColor);
mTextPaint = new Paint();
mTextPaint.setAntiAlias(true);
mTextPaint.setDither(true);
mTextPaint.setStyle(Paint.Style.FILL);
mTextPaint.setTextSize(textSize);
mTextPaint.setColor(textColor);
percent = 0;
p = 100;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int width = 0,height =0;
if (widthMode == MeasureSpec.AT_MOST){
}else{
width = MeasureSpec.getSize(widthMeasureSpec);
}
if (heightMode == MeasureSpec.AT_MOST){
}else{
height = MeasureSpec.getSize(heightMeasureSpec);
}
setMeasuredDimension(width>height?height:width,width>height?height:width);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int rWidth = getWidth()>getHeight()?getHeight():getWidth();
int rHeight = getWidth()>getHeight()?getHeight():getWidth();
//int rWidth = getWidth();
//int rHeight = getHeight();
float radius = rWidth/2 - borderWidth/2;
canvas.drawCircle(rWidth/2,rHeight/2,radius,mOutPaint);
RectF r = new RectF(borderWidth/2,borderWidth/2,
rWidth-borderWidth/2,rHeight-borderWidth/2);
canvas.drawArc(r,0,360*percent,false,mInnerPaint);
String s1 = (int)(percent*100) + "%";
Rect r2 = new Rect();
mTextPaint.getTextBounds(s1,0,s1.length(),r2);
int tWidth = r2.width();
int tHeight = r2.height();
Paint.FontMetricsInt fontMetricsInt = new Paint.FontMetricsInt();
int dy = (fontMetricsInt.bottom-fontMetricsInt.top)/2-fontMetricsInt.bottom;
int baseLine = tHeight/2+dy+rHeight/2-tHeight/2;
int x0 = rWidth/2-tWidth/2;
canvas.drawText(s1,x0,baseLine,mTextPaint);
}
public void setProgress(float percent,int value){
this.percent = percent;
invalidate();
}
}然后在布局中使用：
在activity中使用属性动画完成效果：
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final MyProgress progress = findViewById(R.id.progress);
ValueAnimator animator = ValueAnimator.ofInt(0,5000);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
float p = animation.getAnimatedFraction();
int value = (int)animation.getAnimatedValue();
progress.setProgress(p,value);
}
});
animator.setDuration(10000);
animator.start();
}
}如果我们改动一下代码：
//int rWidth = getWidth();
//int rHeight = getHeight();
看完上述内容，你们掌握怎么在Android中通过自定义View实现一个炫酷的进度条的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注创新互联行业资讯频道，感谢各位的阅读！
本文标题：怎么在Android中通过自定义View实现一个炫酷的进度条
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