标签：自定义 进度条 int float CircleProgressView private Paint public View
继承View重写带两个参数的构造方法,一个参数的不行不会加载视图,构造方法中初始化画笔这样不用没次刷新都要初始化浪费内存,在ondraw方法中绘图,invalidate方法会掉用ondraw方法重新绘制.在attrs中声明你将要设置的属性,名字要和自定义类名一样,在布局文件中引用属性,随便输入属性名然后alt+enter自动生成命名空间,就可以引用自定义属性了.最后在主activity中调用接口,使用传来的参数current
public class MainActivity extends AppCompatActivity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final CircleProgressView myView = findViewById(R.id.circle);
ValueAnimator animator = ValueAnimator.ofFloat(0, 100);
animator.setDuration(4000);
animator.setInterpolator(new LinearInterpolator());
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
float current = (float) animation.getAnimatedValue();
myView.setmCurrent((int) current);
}
});
animator.start();
myView.setOnLoadingCompleteListener(new CircleProgressView.OnLoadingCompleteListener() {
@Override
public void complete(int current) {
System.out.println(current);
if (current == 100) {
myView.setVisibility(View.GONE);
Toast.makeText(MainActivity.this, "加载完成", Toast.LENGTH_SHORT).show();
}
}
});
}
}
主activity
public class CircleProgressView extends View {
private int mCurrent;//当前进度
private Paint mPaintOut;
private Paint mPaintCurrent;
private Paint mPaintText;
private float mPaintWidth;//画笔宽度
private int mPaintColor = Color.RED;//画笔颜色
private int mTextColor = Color.BLACK;//字体颜色
private float mTextSize;//字体大小
private int location;//从哪个位置开始
private float startAngle;//开始角度
public CircleProgressView(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.CircleProgressView);
location = array.getInt(R.styleable.CircleProgressView_location, 1);
mPaintWidth = array.getDimension(R.styleable.CircleProgressView_progress_paint_width, dip2px(context,4));//默认4dp
mPaintColor = array.getColor(R.styleable.CircleProgressView_progress_paint_color, mPaintColor);
mTextSize = array.getDimension(R.styleable.CircleProgressView_progress_text_size, dip2px(context,18));//默认18sp
mTextColor = array.getColor(R.styleable.CircleProgressView_progress_text_color, mTextColor);
array.recycle();
//画笔->背景圆弧
mPaintOut = new Paint();
mPaintOut.setAntiAlias(true);
mPaintOut.setStrokeWidth(mPaintWidth);
mPaintOut.setStyle(Paint.Style.STROKE);
mPaintOut.setColor(Color.GRAY);
mPaintOut.setStrokeCap(Paint.Cap.ROUND);
//画笔->进度圆弧
mPaintCurrent = new Paint();
mPaintCurrent.setAntiAlias(true);
mPaintCurrent.setStrokeWidth(mPaintWidth);
mPaintCurrent.setStyle(Paint.Style.STROKE);
mPaintCurrent.setColor(mPaintColor);
mPaintCurrent.setStrokeCap(Paint.Cap.ROUND);
//画笔->绘制字体
mPaintText = new Paint();
mPaintText.setAntiAlias(true);
mPaintText.setStyle(Paint.Style.FILL);
mPaintText.setColor(mTextColor);
mPaintText.setTextSize(mTextSize);
if (location == 1) {//默认从左侧开始
startAngle = -180;
} else if (location == 2) {
startAngle = -90;
} else if (location == 3) {
startAngle = 0;
} else if (location == 4) {
startAngle = 90;
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
RectF rectF = new RectF(mPaintWidth / 2, mPaintWidth / 2, getWidth() - mPaintWidth / 2, getHeight() - mPaintWidth / 2);
canvas.drawArc(rectF, 0, 360, false, mPaintOut);
//绘制当前进度
float sweepAngle = 360 * mCurrent / 100;
canvas.drawArc(rectF, startAngle, sweepAngle, false, mPaintCurrent);
//绘制进度数字
String text = mCurrent + "%";
//获取文字宽度
float textWidth = mPaintText.measureText(text, 0, text.length());
float dx = getWidth() / 2 - textWidth / 2;
Paint.FontMetricsInt fontMetricsInt = mPaintText.getFontMetricsInt();
float dy = (fontMetricsInt.bottom - fontMetricsInt.top) / 2 - fontMetricsInt.bottom;
float baseLine = getHeight() / 2 + dy;
canvas.drawText(text, dx, baseLine, mPaintText);
if (mLoadingCompleteListener != null ) {
mLoadingCompleteListener.complete(mCurrent);
}
}
public void setmCurrent(int mCurrent) {
this.mCurrent = mCurrent;
invalidate();
}
public interface onl oadingCompleteListener {
void complete(int current);
}
//暴露回调方法
public void setOnLoadingCompleteListener(OnLoadingCompleteListener loadingCompleteListener) {
this.mLoadingCompleteListener = loadingCompleteListener;
}
//监听
/**
* 根据手机的分辨率从 dp 的单位 转成为 px(像素)
*/
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
private onl oadingCompleteListener mLoadingCompleteListener;
}
自定义view
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
xmlns:myview="http://schemas.android.com/apk/res-auto"
android:id="@+id/line1"
android:orientation="vertical"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.january.summer.CircleProgressView
android:id="@+id/circle"
android:layout_width="50dp"
myview:location="left"
android:layout_gravity="center"
android:layout_height="50dp" />
</LinearLayout>
布局文件
<resources>
<declare-styleable name="CircleProgressView">//要跟类名一样
<!--画笔宽度-->
<attr name="progress_paint_width" format="dimension" />
<!--画笔颜色-->
<attr name="progress_paint_color" format="color" />
<!--字体颜色-->
<attr name="progress_text_color" format="color" />
<!--字体尺寸-->
<attr name="progress_text_size" format="dimension" />
<!--加载进度的开始位置-->
<attr name="location" format="enum">
<enum name="left" value="1" />
<enum name="top" value="2" />
<enum name="right" value="3" />
<enum name="bottom" value="4" />
</attr>
</declare-styleable>
</resources>
attrs文件,注意,demension属性使用时自动把dp转为px
标签：自定义,进度条,int,float,CircleProgressView,private,Paint,public,View 来源： https://www.cnblogs.com/Ocean123123/p/11028344.html
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