怎么在Android中自定义一个圆形进度条效果?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。
Android是什么
Android是一种基于Linux内核的自由及开放源代码的操作系统,主要使用于移动设备,如智能手机和平板电脑,由美国Google公司和开放手机联盟领导及开发。
1 控件 RoundProgress
package listview.tianhetbm.p2p.ui;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;import android.util.AttributeSet;import android.util.Log;import android.view.View;import listview.tianhetbm.p2p.R;public class RoundProgress extends View { private Paint paint = new Paint(); private int roundColor; private int roundProgressColor; private int textColor; private float textSize; private float roundWidth; private int max = 100; private int progress = 50; public RoundProgress(Context context) { this(context, null); } public RoundProgress(Context context, AttributeSet attrs) { this(context, attrs, 0); } public RoundProgress(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.RoundProgress); //圆环的颜色 roundColor = ta.getColor(R.styleable.RoundProgress_roundColor, Color.RED); //圆环进度的颜色 roundProgressColor = ta.getColor(R.styleable.RoundProgress_roundProgressColor, Color.GREEN); //中间进度百分比文字字符串的颜色 textColor = ta.getColor(R.styleable.RoundProgress_textColor, Color.GREEN); //中间进度百分比的字符串的字体大小 textSize = ta.getDimension(R.styleable.RoundProgress_textSize, 15); //圆环的宽度 roundWidth = ta.getDimension(R.styleable.RoundProgress_roundWidth, 5); ta.recycle(); } @Override protected void onDraw(Canvas canvas) {//第一步:绘制一个最外层的圆 paint.setColor(roundColor); paint.setStrokeWidth(roundWidth); paint.setStyle(Paint.Style.STROKE); paint.setAntiAlias(true); int center = getWidth() / 2; int radius = (int) (center - roundWidth / 2-45); //canvas.drawCircle(center, center, radius, paint); RectF oval = new RectF(center - radius, center - radius, center + radius, center + radius); canvas.drawArc(oval, 135, 270, false, paint); //第二步:绘制正中间的文本 float textWidth = paint.measureText(progress + "%"); paint.setColor(textColor); paint.setTextSize(textSize); paint.setStrokeWidth(0); canvas.drawText(progress + "%", center - textWidth / 2, center + textSize / 2, paint); //第三步: //RectF oval = new RectF(center - radius, center - radius, center + radius, center + radius); paint.setColor(roundProgressColor); paint.setStrokeWidth(roundWidth); paint.setStyle(Paint.Style.STROKE); canvas.drawArc(oval, 135, 270 * progress / max, false, paint); Log.e("测试角度",(270 * progress / max)+""); Paint mp=new Paint(); mp.setAntiAlias(true); Bitmap bitmap= BitmapFactory.decodeResource(getResources(),R.drawable.tiger); int bitmapHeight = bitmap.getHeight()/2; int bitmapWidth = bitmap.getWidth()/2; //canvas.translate(-center, center); float y=0f,x=0f;// if(270 * progress / max<=45){ y = (float) (center-bitmapWidth - (radius) * Math.cos((270 * progress / max+225)*Math.PI/180)); x = (float) (center-bitmapWidth + (radius) * Math.sin((270 * progress / max+225)*Math.PI/180));// } //canvas.translate(center, center*2); Log.e("测试角度", y + "-----" + x); canvas.drawBitmap(bitmap, x, y, mp); } public void setProgress(int progress){ this.progress = progress; if(progress>100){ this.progress = 100; } postInvalidate(); }}
2 xml 布局文件
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_horizontal"> <listview.tianhetbm.p2p.ui.RoundProgress android:layout_marginTop="30dp" android:layout_width="250dp" android:layout_height="250dp" android:layout_marginLeft="10dp" app:roundColor="@color/back_blue" app:roundProgressColor="@color/back_orange" android:id="@+id/ce" app:roundWidth="10dp" app:textSize="18sp" app:textColor="@color/record_red" /></RelativeLayout>
3 activity(主要代码)
super.onCreate(savedInstanceState); setContentView(R.layout.activity_main_three); ButterKnife.bind(this); new Thread(){ @Override public void run() { while (progress<80){ progress+=1; ce.setProgress(progress); try { Thread.sleep(50); } catch (Exception e) { e.printStackTrace(); } } }}.start();
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