[英]Custom circular image progress bar with transparent background
我有計時器的圓形圖片:
我想創建一個包含此圖片的圓形進度條,這將使其像時鍾一樣緩慢地變空,直到完全消失(如動畫)。
例如,在一半的時間之后,我將其定義為:
現在,我以這種方式進行操作:我將計時器圖像作為圖像放置在屏幕上,並在其上放置了規則的圓形進度條,並使用顏色作為隱藏圖像的背景顏色(這樣我就得到了預期的效果) 。
但是現在我在應用程序的背景中只有幾種顏色時遇到了問題,因為我無法使進度條具有與背景相同的顏色,所以我在尋找一種新的制作方法,例如自定義進度條由具有透明背景的計時器圖像組成。
請幫助我如何更改代碼以獲取它:
ProgressBar XML:
<ProgressBar
android:id="@+id/progressBar"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:progress="100"
android:rotation="90"
style="?android:progressBarStyleHorizontal"
android:progressDrawable="@drawable/prog_blue"/>
Prog_blue(progressBar的可繪制對象)-藍色是應用程序的背景色:
<?xml version="1.0" encoding="utf-8"?>
<scale
android:fromDegrees="270"
android:pivotX="50%"
android:pivotY="50%"
xmlns:android="http://schemas.android.com/apk/res/android">
<shape
android:shape="ring"
android:innerRadiusRatio="2.7"
android:thickness="23dp"
xmlns:android="http://schemas.android.com/apk/res/android">
<gradient
android:startColor="@color/prog_blue"
android:endColor="@color/prog_blue"
android:type="sweep"
android:useLevel="false"/>
</shape>
</scale>
您可以創建自定義View
來實現
這是我的代碼:
ClockProgressBar.java
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
public class ClockProgressBar extends View {
Paint tickPaint;
private int shortTickLen=10;
private int longTickLen=20;
private int finalWidth=0;
private int finalHeight=0;
private int r=0;
private Path ticksPath;
int tickNumbers=60;
private ValueAnimator animator;
public ClockProgressBar(Context context) {
super(context);
ini();
}
public ClockProgressBar(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
ini();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawIntervals(canvas);
}
void drawIntervals(Canvas canvas){
double cX = getX()+finalWidth/2;
double cY = getY()+finalHeight/2;
ticksPath=new Path();
for ( int i=1; i<= tickNumbers; i++){
int len = shortTickLen;
if ( i % 15 == 0 ){
len = longTickLen;
}else if ( i % 5 == 0 ){
len = longTickLen;
}
double di = (double)i;
double angleFrom12 = di/60.0*2.0*Math.PI;
double angleFrom3 = Math.PI/2.0-angleFrom12;
ticksPath.moveTo(
(float)(cX+Math.cos(angleFrom3)*r),
(float)(cY-Math.sin(angleFrom3)*r)
);
ticksPath.lineTo(
(float)(cX+Math.cos(angleFrom3)*(r-len)),
(float)(cY-Math.sin(angleFrom3)*(r-len))
);
}
canvas.drawPath(ticksPath,tickPaint);
}
void ini(){
tickPaint=new Paint();
tickPaint.setStrokeCap(Paint.Cap.BUTT);
tickPaint.setStrokeJoin(Paint.Join.ROUND);
tickPaint.setAntiAlias(true);
tickPaint.setStyle(Paint.Style.STROKE);
tickPaint.setStrokeWidth(8);
tickPaint.setStrokeMiter(2f);
tickPaint.setColor(Color.BLACK);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
finalWidth = getMeasuredWidth() / 2;
finalHeight = getMeasuredWidth() / 2;
r = (finalWidth / 2);
setMeasuredDimension(finalWidth, finalHeight );
}
public void startAnimation(){
animator = ValueAnimator.ofInt(60, 0);
animator.setDuration(5000);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
public void onAnimationUpdate(ValueAnimator animation) {
tickNumbers= (int) animation.getAnimatedValue();
invalidate();
}
});
animator.setRepeatCount(Integer.MAX_VALUE);
animator.start();
}
public void stopAnimation(){
if (animator!=null){
animator.cancel();
}
setVisibility(GONE);
}
}
並在xml中使用
activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<<Your Package Name>.ClockProgressBar
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/progress"/>
</LinearLayout>
並在您的活動中調用它,並使用startAnimation()
和stopAnimation()
顯示和關閉View
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ClockProgressBar progressBar=findViewById(R.id.progress);
progressBar.startAnimation();
}
}
最終結果 :
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