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這篇文章主要詳解Android中SurfaceView畫板操作，內容清晰明了，對此有興趣的小伙伴可以學習一下，相信大家閱讀完之后會有幫助。
畫板——畫路徑
package com.example.review.view;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
/**
* 畫板畫路徑
*/
public class HuabanView extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder surfaceHolder;
private Path path = new Path();
public HuabanView(Context context) {
super(context);
}
public HuabanView(Context context, AttributeSet attrs) {
super(context, attrs);
surfaceHolder = getHolder();
surfaceHolder.addCallback(this);//獲得surfaceview的生命周期
}
public HuabanView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public HuabanView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
new HuabanThread().start();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
int action = event.getAction();
if (action == MotionEvent.ACTION_DOWN) {//按下
path.moveTo(x, y);
} else if (action == MotionEvent.ACTION_MOVE) {//移動
path.lineTo(x, y);
}
return true;
}
class HuabanThread extends Thread {
@Override
public void run() {
super.run();
//TODO:畫筆
Paint paint = new Paint();
paint.setColor(Color.BLACK);
paint.setStrokeWidth(20);
paint.setStyle(Paint.Style.STROKE);
paint.setAntiAlias(true);
//TODO:畫布
while (true) {
Canvas canvas = surfaceHolder.lockCanvas();
//避免空指針
if (canvas == null){
return;
}
canvas.drawColor(Color.WHITE, PorterDuff.Mode.CLEAR);
canvas.drawColor(Color.WHITE);
canvas.drawPath(path,paint);
surfaceHolder.unlockCanvasAndPost(canvas);
}
}
}
public void close(){
path.reset();
}
}畫板——畫動態直線
package com.example.review.view;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.util.AttributeSet;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
/**
* 畫板畫路徑
* 畫動態直線
*/
public class LineView extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder surfaceHolder;
private Path path = new Path();
private int x = 0;
public LineView(Context context) {
super(context);
}
public LineView(Context context, AttributeSet attrs) {
super(context, attrs);
surfaceHolder = getHolder();
surfaceHolder.addCallback(this);//獲得surfaceview的生命周期
}
public LineView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public LineView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
new HuabanThread().start();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
class HuabanThread extends Thread {
@Override
public void run() {
super.run();
//TODO:畫筆
Paint paint = new Paint();
paint.setColor(Color.BLACK);
paint.setStrokeWidth(20);
paint.setStyle(Paint.Style.STROKE);
paint.setAntiAlias(true);
//TODO:畫布
while (true) {
Canvas canvas = surfaceHolder.lockCanvas();
//避免空指針
if (canvas == null){
return;
}
canvas.drawColor(Color.WHITE, PorterDuff.Mode.CLEAR);
canvas.drawColor(Color.WHITE);
canvas.drawLine(0,100,x++,100,paint);
surfaceHolder.unlockCanvasAndPost(canvas);
}
}
}
public void close(){
path.reset();
}
}基本圖形
//圓
canvas.drawOval(50,100,150,200,paint);
//半圓
canvas.drawArc(500,500,700,700,20,180,true,paint);
//矩形
canvas.drawRect(100,300,250,400,paint);
//三角形
canvas.drawLine(100,450,0,600,paint);
canvas.drawLine(0,600,400,600,paint);
canvas.drawLine(100,450,400,600,paint);
//梯形
canvas.drawLine(100,700,200,700,paint);
canvas.drawLine(100,700,0,900,paint);
canvas.drawLine(0,900,400,900,paint);
canvas.drawLine(200,700,400,900,paint);
//文字
canvas.drawText("截圖",100,1000,paint);看完上述內容，是不是對詳解Android中SurfaceView畫板操作有進一步的了解，如果還想學習更多內容，歡迎關注億速云行業資訊頻道。
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