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在我的SurfaceView中，当我点击屏幕时，它会创建黑点，然后连接它们，并且它具有填充颜色。之后，我正在努力绘制其他位图，我希望当前状态像背景一样，当我触摸屏幕时，我想在此位置绘制位图，并且当我试图在触摸位置上绘制位图时，画布会进入回到之前的状态。在已绘制的SurfaceView背景上绘制位图
这里是我的代码：
package com.inveitix.android.clue.ui.views;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Shader;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import com.inveitix.android.clue.R;
import com.inveitix.android.clue.cmn.Door;
import com.inveitix.android.clue.cmn.MapPoint;
import java.util.ArrayList;
import java.util.List;
public class DrawingView extends SurfaceView {
private static final String TAG = "DrawingView";
private static final float DOOR_SIZE = 30;
private Paint paint;
private Canvas canvas;
private int maxHeight;
private int maxWidth;
private SurfaceHolder surfaceHolder;
private List<MapPoint> shape;
private List<Door> doors;
private float ratio;
private boolean isFloorFinished;
private boolean isDoorSelected;
Path path;
public DrawingView(Context context) {
super(context);
init();
}
public DrawingView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public DrawingView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
public void setIsDoorSelected(boolean isDoorSelected) {
this.isDoorSelected = isDoorSelected;
}
public void setIsFloorFinished(boolean isFloorFinished) {
this.isFloorFinished = isFloorFinished;
}
private void init() {
paint = new Paint(Paint.ANTI_ALIAS_FLAG);
isFloorFinished = false;
surfaceHolder = this.getHolder();
prepareCanvas();
paint.setColor(Color.BLACK);
paint.setStyle(Paint.Style.FILL);
shape = new ArrayList<>();
doors = new ArrayList<>();
}
private void prepareCanvas() {
surfaceHolder.addCallback(new SurfaceHolder.Callback() {
public void surfaceDestroyed(SurfaceHolder holder) {
}
public void surfaceCreated(SurfaceHolder holder) {
canvas = holder.lockCanvas();
canvas.drawColor(Color.WHITE);
holder.unlockCanvasAndPost(canvas);
}
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
});
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int minw = getPaddingLeft() + getPaddingRight() + getSuggestedMinimumWidth();
int minh = getPaddingBottom() + getPaddingTop() + getSuggestedMinimumHeight();
this.maxWidth = resolveSizeAndState(minw, widthMeasureSpec, 1);
this.maxHeight = resolveSizeAndState(minh, heightMeasureSpec, 1);
if (ratio != 0) {
maxHeight = (int) (maxWidth/ratio);
}
Log.i(TAG, "onMeasure width:" + maxWidth);
Log.i(TAG, "onMeasure height:" + maxHeight);
setMeasuredDimension(maxWidth, maxHeight);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN && !isFloorFinished) {
if (surfaceHolder.getSurface().isValid()) {
shape.add(new MapPoint(event.getX(), event.getY()));
canvas = surfaceHolder.lockCanvas();
canvas.drawColor(Color.WHITE);
for (MapPoint point : shape) {
canvas.drawCircle(point.getX(), point.getY(), 10, paint);
}
surfaceHolder.unlockCanvasAndPost(canvas);
}
} else if (event.getAction() == MotionEvent.ACTION_DOWN && isDoorSelected) {
if (surfaceHolder.getSurface().isValid()) {
Door door = new Door();
door.setConnectedTo("door1"); //this is for test
door.setX(event.getX());
door.setY(event.getY());
doors.add(door);
canvas = surfaceHolder.lockCanvas();
drawDoors(canvas);
surfaceHolder.unlockCanvasAndPost(canvas);
}
}
return false;
}
public void drawFloor() {
Bitmap bmpFloorPattern = BitmapFactory.decodeResource(getResources(), R.drawable.floor_pattern6);
BitmapShader patternBMPshader = new BitmapShader(bmpFloorPattern,
Shader.TileMode.REPEAT, Shader.TileMode.REPEAT);
canvas = surfaceHolder.lockCanvas();
path = new Path();
path.reset();
if (shape != null) {
path.moveTo(shape.get(0).getX(), shape.get(0).getY());
alignPoints(path);
canvas.drawColor(Color.WHITE);
for (int i = 0; i < shape.size(); i++) {
path.lineTo(shape.get(i).getX(), shape.get(i).getY());
}
}
paint.setShader(patternBMPshader);
path.close();
canvas.drawPath(path, paint);
paint.setShader(null);
surfaceHolder.unlockCanvasAndPost(canvas);
}
public void drawDoors(Canvas canvas) {
Bitmap bmpDoor = BitmapFactory.decodeResource(getResources(), R.drawable.door32);
paint.setFilterBitmap(true);
if (doors != null && doors.size() > 0) {
for (Door door : doors) {
canvas.drawBitmap(bmpDoor, door.getX() - DOOR_SIZE, door.getY() - DOOR_SIZE, null);
}
}
}
private void alignPoints(Path path) {
MapPoint previousPoint = null;
for (int i = 0; i < shape.size(); i++) {
float x = shape.get(i).getX();
float y = shape.get(i).getY();
if (previousPoint != null) {
float deltaX = Math.abs(x - previousPoint.getX());
float deltaY = Math.abs(y - previousPoint.getY());
if (Math.max(deltaX, deltaY) == deltaX) {
x = previousPoint.getX();
} else {
y = previousPoint.getY();
}
}
path.lineTo(x, y);
previousPoint = shape.get(i);
}
}
public void setWidthToHeightRatio(float ratio) {
this.ratio = ratio;
maxHeight = (int) (maxWidth/ratio);
invalidate();
requestLayout();
}
}
任何想法如何绘制在绘制的背景是什么？
drawFloor（）未在代码片段调用。你可以显示你的整个绘制序列的代码？ – hg123
使用完整代码更新了问题。 – Tito
仍然没有看到drawFloor（）被调用的地方。此外，如果我正确理解您的问题，您正在绘制背景，然后绘制触摸位置，但它们并未出现 - 是否正确？ – hg123