我目前正在构建一个基于难度设置产生迷宫的Android应用程序（容易产生带边框的5x5迷宫，中等8x8，硬11x11）。迷宫由黑色方块组成，其位置构成从左上角到右下角的路径，其他方向以及迷宫周围的单边形边界。如果有一个黑色方块，你就不能朝那个方向移动......等等，目前只构建了界面，而不是任何用户交互（我稍后会添加）。代码也有点乱 - 我知道这一点，并在问题解决后将其解决。
这个问题是没有显示迷宫 - 只是一个白色的空白区域！我正在为主界面使用XML文件和活动，并以迷宫形式使用自定义视图。
这是在游戏中创建界面的活动/类。此处使用的Level类包含有关当前分数/迷宫/用户位置等的数据。它已经过测试，我非常有信心它可以正常工作。
public class InGameInterface extends Activity {
Level level;;
MazeView maze;
private boolean[][] currentMaze = null;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.in_game_interface);
level = new Level();
currentMaze = level.getNewMaze();
loadMazeDisplay();
}
private void loadMazeDisplay()
{
maze = new MazeView(this, level, currentMaze);
RelativeLayout mazeHolder = (RelativeLayout) findViewById(R.id.maze);
LayoutParams lP = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
mazeHolder.addView(maze, lP);
}
}
下面是我试图插入自定义视图的XML文件的相关部分。<丢失了，因为Stack Overflow在这里不喜欢它们。
RelativeLayout
android:id="@+id/maze"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="7dp"
android:layout_marginRight="15dp"
android:layout_weight="2" >
RelativeLayout
以下是构建并应显示迷宫的MazeView。
public class MazeView extends View
{
private Activity context;
private Level level;
private boolean mazeIsPath[][] = null;
private Integer widthInPixels = 0, heightInPixels = 0;
private Integer cellWidthInPixels = 0, cellHeightInPixels = 0;
private Paint cell, ball, background, target;
public MazeView(Context context, Level level, boolean[][] maze)
{
super(context);
this.context = (Activity) context;
this.level = level;
mazeIsPath = maze;
cell = new Paint();
cell.setColor(getResources().getColor(R.color.textColor));
ball = new Paint();
ball.setColor(getResources().getColor(R.color.splashBackground));
background = new Paint();
background.setColor(getResources().getColor(R.color.gameInterfaceBackground));
target = new Paint();
target.setColor(getResources().getColor(R.color.buttonBackground));
widthInPixels = this.getWidth();
heightInPixels = this.getHeight();
setFocusable(true);
this.setFocusableInTouchMode(true);
}
protected void onSizeChanged(Integer newW, Integer newH, Integer oldW, Integer oldH)
{
widthInPixels = newW;
heightInPixels = newH;
super.onSizeChanged(newW, newH, oldW, oldH);
}
protected void onDraw(Canvas canvas)
{
Integer counterX = 0, counterY = 0;
canvas.drawRect(0, 0, widthInPixels, heightInPixels, background);
for(counterX = 0; counterX < level.getWidth(); counterX++)
{
for(counterY = 0; counterY < level.getHeight(); counterY++)
{
if(mazeIsPath[counterX][counterY] != true)
{
canvas.drawRect((float)(cellWidthInPixels * counterX), (float)(cellHeightInPixels * counterX), (float)(cellWidthInPixels * (counterX + 1)), (float)(cellHeightInPixels * (counterY + 1)), cell);
}
}
}
canvas.drawCircle( (float)((cellWidthInPixels * level.getCurrentX()) + (0.5f*(cellWidthInPixels))), (float)((cellHeightInPixels * level.getCurrentX()) + (0.5f*(cellHeightInPixels))), (float)(cellHeightInPixels * (2f/3f)), ball);
canvas.drawCircle( (float)((cellWidthInPixels * level.getFinalX()) + (0.5f*(cellWidthInPixels))), (float)((cellHeightInPixels * level.getFinalX()) + (0.5f*(cellHeightInPixels))), (float)(cellHeightInPixels * (4f/5f)), target);
}
}
我想知道是否有人可以指出我哪里出错了以及如何解决它！
对onDraw（）的第一次修订：
protected void onDraw(Canvas canvas)
{
Integer counterX = 0, counterY = 0;
widthInPixels = new Integer(canvas.getWidth());
heightInPixels = new Integer(canvas.getHeight());
canvas.drawRect(0, 0, widthInPixels, heightInPixels, background);
for(counterX = 0; counterX < level.getWidth(); counterX++)
{
for(counterY = 0; counterY < level.getHeight(); counterY++)
{
if(mazeIsPath[counterX][counterY] != true)
{
canvas.drawRect((float)(cellWidthInPixels * counterX), (float)(cellHeightInPixels * counterX), (float)(cellWidthInPixels * (counterX + 1)), (float)(cellHeightInPixels * (counterY + 1)), cell);
}
}
}
canvas.drawCircle( (float)((cellWidthInPixels * level.getCurrentX()) + (0.5f*(cellWidthInPixels))), (float)((cellHeightInPixels * level.getCurrentX()) + (0.5f*(cellHeightInPixels))), (float)(cellHeightInPixels * (2f/3f)), ball);
canvas.drawCircle( (float)((cellWidthInPixels * level.getFinalX()) + (0.5f*(cellWidthInPixels))), (float)((cellHeightInPixels * level.getFinalX()) + (0.5f*(cellHeightInPixels))), (float)(cellHeightInPixels * (4f/5f)), target);
Log.w("onDraw width", widthInPixels.toString());
Log.w("onDraw height", heightInPixels.toString());
Integer cWidth = new Integer(canvas.getWidth());
Integer cHeight = new Integer(canvas.getHeight());
Log.w("canvas width", cWidth.toString());
Log.w("cavas height", cHeight.toString());
}
答案 0 :(得分：0)
我说，忘了widthInPixels＆amp; heightInPixels，因为它们取决于布局。要使用它们，您必须实现onMeasure（这可能是有趣的）。但是，由于您的观点非常简单，只需使用canvas.getWidth()和getHeight()中的值即可。请尝试以下操作以查看其是否有效
private static final int CELLS_PER_SCREEN = 5; // the number of cells that fit on a view
protected void onDraw(Canvas canvas) {
int totalWidth=canvas.getWidth(),
totalHeight=canvas.getHeight(),
cellWidthInPixels=totalWidth / CELLS_PER_SCREEN,
cellHeightInPixels=totalHeight / CELLS_PER_SCREEN;
canvas.drawRect(0, 0, totalWidth, totalHeight, background);
for (int counterX = 0, xlen=level.getWidth(); counterX < xlen; counterX++) {
for (int counterY = 0, ylen=level.getHeight(); counterY < ylen; counterY++) {
if (!mazeIsPath[counterX][counterY]) {
canvas.drawRect(
(float)(cellWidthInPixels * counterX),
(float)(cellHeightInPixels * counterX),
(float)(cellWidthInPixels * (counterX + 1)),
(float)(cellHeightInPixels * (counterY + 1)), cell
);
}
}
}
canvas.drawCircle( (float)((cellWidthInPixels * level.getCurrentX()) + (0.5f*(cellWidthInPixels))), (float)((cellHeightInPixels * level.getCurrentX()) + (0.5f*(cellHeightInPixels))), (float)(cellHeightInPixels * (2f/3f)), ball);
canvas.drawCircle( (float)((cellWidthInPixels * level.getFinalX()) + (0.5f*(cellWidthInPixels))), (float)((cellHeightInPixels * level.getFinalX()) + (0.5f*(cellHeightInPixels))), (float)(cellHeightInPixels * (4f/5f)), target);
Log.w("onDraw width", widthInPixels.toString());
Log.w("onDraw height", heightInPixels.toString());
Integer cWidth = new Integer(canvas.getWidth());
Integer cHeight = new Integer(canvas.getHeight());
Log.w("canvas width", cWidth.toString());
Log.w("cavas height", cHeight.toString());
}
还有一些关于onDraw的建议：OnDraw被非常频繁地调用，并且尽可能优化它是非常重要的。
int而不是Integers，Integer是一个Object，而int只是一个快速的原始类型。