在 Android Studio 中添加延迟计时器 [英] Add a delay timer in Android Studio
本文介绍了在 Android Studio 中添加延迟计时器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
FaceView.java
FaceView.java
package com.example.richelle.neeuro;
public class FaceView extends View {
private float radius;
NormalFace normalFace;
HappyFace happyFace;
public FaceView(Context context, AttributeSet attrs) {
super(context, attrs);
// get radius value
TypedArray a = context.getTheme().obtainStyledAttributes(
attrs,
R.styleable.FaceView,
0, 0
);
try {
radius = a.getDimension(R.styleable.FaceView_radius, 20.0f);
} finally {
a.recycle();
}
// initiate HappyFace class
normalFace = new NormalFace(radius);
happyFace = new HappyFace(radius);
}
Handler setDelay;
Runnable startDelay;
@Override
protected void onDraw(final Canvas canvas) {
super.onDraw(canvas);
normalFace.draw(canvas);
//delay timer
setDelay = new Handler();
startDelay = new Runnable() {
@Override
public void run() {
happyFace.draw(canvas);
}
};
setDelay.postDelayed(startDelay,5000);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int desiredWidth = (int) radius*2+(int) Math.ceil((radius/1.70));
int desiredHeight = (int) radius*2+(int)Math.ceil((radius/1.70));
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
int width;
int height;
//Measure Width
if (widthMode == MeasureSpec.EXACTLY) {
//Must be this size
width = widthSize;
} else if (widthMode == MeasureSpec.AT_MOST) {
//Can't be bigger than...
width = Math.min(desiredWidth, widthSize);
Log.d("Width AT_MOST", "width: "+width);
} else {
//Be whatever you want
width = desiredWidth;
Log.d("Width ELSE", "width: "+width);
}
//Measure Height
if (heightMode == MeasureSpec.EXACTLY) {
//Must be this size
height = heightSize;
} else if (heightMode == MeasureSpec.AT_MOST) {
//Can't be bigger than...
height = Math.min(desiredHeight, heightSize);
} else {
//Be whatever you want
height = desiredHeight;
}
//MUST CALL THIS
setMeasuredDimension(width, height);
}
public float getRadius() {
return radius;
}
public void setRadius(float radius) {
this.radius = radius;
}
}
NormalFace.java
NormalFace.java
public class NormalFace {
//Paint object
Paint facePaint;
Paint mePaint;
float radius;
float adjust;
float mouthLeftX, mouthRightX, mouthTopY, mouthBottomY;
RectF mouthRectF;
Path mouthPath;
float eyeLeftX, eyeRightx, eyeTopY, eyeBottomY;
RectF eyeLeftRectF, eyeRightRectF;
public NormalFace(float radius){
this.radius= radius;
facePaint = new Paint();
facePaint.setColor(0xfffed325); // face color - yellow
facePaint.setDither(true);
facePaint.setStrokeJoin(Paint.Join.ROUND);
facePaint.setStrokeCap(Paint.Cap.ROUND);
facePaint.setPathEffect(new CornerPathEffect(10) );
facePaint.setAntiAlias(true);
facePaint.setShadowLayer(4, 2, 2, 0x80000000);
mePaint = new Paint();
mePaint.setColor(0xff2a2a2a); //black
mePaint.setDither(true);
mePaint.setStyle(Paint.Style.STROKE);
mePaint.setStrokeJoin(Paint.Join.ROUND);
mePaint.setStrokeCap(Paint.Cap.ROUND);
mePaint.setPathEffect(new CornerPathEffect(10) );
mePaint.setAntiAlias(true);
mePaint.setStrokeWidth(radius / 14.0f);
adjust = radius / 3.2f;
// Left Eye
eyeLeftX = radius-(radius*0.43f);
eyeRightx = eyeLeftX + (radius*0.3f);
eyeTopY = radius-(radius*0.5f);
eyeBottomY = eyeTopY + (radius*0.4f);
eyeLeftRectF = new RectF(eyeLeftX+adjust,eyeTopY+adjust,eyeRightx+adjust,eyeBottomY+adjust);
// Right Eye
eyeLeftX = eyeRightx + (radius*0.3f);
eyeRightx = eyeLeftX + (radius*0.3f);
eyeRightRectF = new RectF(eyeLeftX+adjust,eyeTopY+adjust,eyeRightx+adjust,eyeBottomY+adjust);
// Mouth
mouthLeftX = radius-(radius/2.0f);
mouthRightX = mouthLeftX+ radius;
// mouthTopY = 125 - (125*0.01f);
// mouthBottomY = mouthTopY + (125*0.01f);
mouthTopY = radius - (radius*(-0.2f));
mouthBottomY = mouthTopY + (radius*0.01f);
mouthRectF = new RectF(mouthLeftX+adjust,mouthTopY+adjust,mouthRightX+adjust,mouthBottomY+adjust);
//mouthRectF = new RectF(mouthLeftX+adjust,mouthTopY+70,mouthRightX+adjust,mouthBottomY+20); //a line
mouthPath = new Path();
mouthPath.arcTo(mouthRectF, 30, 120, true);
// mouthPath.arcTo(mouthRectF, 15, 135, true);
}
public void draw(Canvas canvas) {
// 1. draw face
canvas.drawCircle(radius+adjust, radius+adjust, radius, facePaint);
// 2. draw mouth
mePaint.setStyle(Paint.Style.STROKE);
canvas.drawPath(mouthPath, mePaint);
//canvas.drawLine(90, 155, 176, 155, mePaint);
// 3. draw eyes
mePaint.setStyle(Paint.Style.FILL);
canvas.drawArc(eyeLeftRectF, 0, 360, true, mePaint);
canvas.drawArc(eyeRightRectF, 0, 360, true, mePaint);
}
}
HappyFace.java
HappyFace.java
public class HappyFace {
//Paint object
Paint facePaint;
Paint mePaint;
float radius;
float adjust;
float mouthLeftX, mouthRightX, mouthTopY, mouthBottomY;
RectF mouthRectF;
Path mouthPath;
float eyeLeftX, eyeRightx, eyeTopY, eyeBottomY;
RectF eyeLeftRectF, eyeRightRectF;
public HappyFace(float radius){
this.radius= radius;
facePaint = new Paint();
facePaint.setColor(0xfffed325); // face color - yellow
facePaint.setDither(true);
facePaint.setStrokeJoin(Paint.Join.ROUND);
facePaint.setStrokeCap(Paint.Cap.ROUND);
facePaint.setPathEffect(new CornerPathEffect(10) );
facePaint.setAntiAlias(true);
facePaint.setShadowLayer(4, 2, 2, 0x80000000);
mePaint = new Paint();
mePaint.setColor(0xff2a2a2a); //black
mePaint.setDither(true);
mePaint.setStyle(Paint.Style.STROKE);
mePaint.setStrokeJoin(Paint.Join.ROUND);
mePaint.setStrokeCap(Paint.Cap.ROUND);
mePaint.setPathEffect(new CornerPathEffect(10) );
mePaint.setAntiAlias(true);
mePaint.setStrokeWidth(radius / 14.0f);
adjust = radius / 3.2f;
// Left Eye
eyeLeftX = radius-(radius*0.43f);
eyeRightx = eyeLeftX + (radius*0.3f);
eyeTopY = radius-(radius*0.5f);
eyeBottomY = eyeTopY + (radius*0.4f);
eyeLeftRectF = new RectF(eyeLeftX+adjust,eyeTopY+adjust,eyeRightx+adjust,eyeBottomY+adjust);
// Right Eye
eyeLeftX = eyeRightx + (radius*0.3f);
eyeRightx = eyeLeftX + (radius*0.3f);
eyeRightRectF = new RectF(eyeLeftX+adjust,eyeTopY+adjust,eyeRightx+adjust,eyeBottomY+adjust);
// Smiley Mouth
mouthLeftX = radius-(radius/2.0f);
mouthRightX = mouthLeftX+ radius;
mouthTopY = radius - (radius*0.2f);
mouthBottomY = mouthTopY + (radius*0.5f);
mouthRectF = new RectF(mouthLeftX+adjust,mouthTopY+adjust,mouthRightX+adjust,mouthBottomY+adjust);
mouthPath = new Path();
mouthPath.arcTo(mouthRectF, 30, 120, true);
}
public void draw(Canvas canvas) {
// 1. draw face
canvas.drawCircle(radius+adjust, radius+adjust, radius, facePaint);
// 2. draw mouth
mePaint.setStyle(Paint.Style.STROKE);
canvas.drawPath(mouthPath, mePaint);
// 3. draw eyes
mePaint.setStyle(Paint.Style.FILL);
canvas.drawArc(eyeLeftRectF, 0, 360, true, mePaint);
canvas.drawArc(eyeRightRectF, 0, 360, true, mePaint);
}
}
FaceView.java 是在画布中显示不同的面部表情.NormalFace.java 和 HappyFace.java 是不同面部表情的 UI.我想在FaceView.java中添加一个延时定时器，这样在定时器倒计时结束后，正常人脸的显示可以变成笑脸.
FaceView.java is to display the different facial expressions in the canvas. The NormalFace.java and HappyFace.java are the UI of the different facial expressions. I want to add a delay timer in FaceView.java so that the display of the normal face can be change to a happy face after the timer had finished counting down.
推荐答案
你可以使用Handler来延迟你的下一个任务
You can use Handler to delay your next task
import android.os.Handler;
Handler handler=new Handler();
Runnable r=new Runnable() {
public void run() {
// Your next task
}
};
handler.postDelayed(r, 30000);
30000 是以毫秒为单位的延迟值，使其为 30 秒
30000 is the value of delay in milli seconds which makes it 30 secs
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