凡设置绘制的边界自定义视图 [英] Where to set bounds of a drawable in a custom view
问题描述
概述：我真的试图创建一些简单的形状（正方形和三角形），然后使用它们作为一个活动的背景图像。形状的大小取决于屏幕的宽度和高度。问题是，即使我设置这些形状的边界，他们都被吸引尽可能地大，同时还在屏幕内配合。
Overview: I`m trying to create some simple shapes (squares and triangles) and then use them as the background image for an activity. The sizes of the shapes depend on the width and height of the screen. The problem is, even though I am setting the bounds of these shapes, they are all being drawn as big as possible while still fitting inside the screen.
详细信息：我想在名为ControlsOverlayView.java被覆盖的视图类一对夫妇它的形状创建一个非常简单的背景图像。我搞清楚画布的大小是什么，然后调用的方法的onDraw我的绘制方法，因为这是我第一次知道画布有多大。我已经双重通过经由code，每个形状具有正确的边界步进检查，但问题是，没有任何形状都服从其边界内，并且每个形状绘制大，因为它可以有可能在屏幕上去。
Details: I am trying to create a very simple background image with a couple of shapes on it in an overridden view class called ControlsOverlayView.java. I am figuring out what the size of the canvas and then calling my paint method in the onDraw method, because this is when I first know how big the canvas is. I have double checked by stepping through the code that each shape has the correct bounds, but the problem is that none of the shapes are obeying their bounds, and each shape is drawing as big as it can possibly go on the screen.
public class ControlsOverlayView extends View{
// graphical constants
private static int SIDE_ARROW_WIDTH;
...
...
public ControlsOverlayView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onDraw(Canvas canvas) {
resize(canvas.getWidth(), canvas.getHeight());
paintControls();
super.onDraw(canvas);
}
private void resize(int width, int height) {
// initialize screen size
SCREEN_WIDTH = width;
SCREEN_HEIGHT = height;
HALF_WIDTH = SCREEN_WIDTH / 2;
HALF_HEIGHT = SCREEN_HEIGHT / 2;
SIDE_ARROW_HEIGHT = SCREEN_WIDTH/6;
SIDE_ARROW_WIDTH = SIDE_ARROW_HEIGHT/2;
// calculate constants
TEXT_FONT_HEIGHT = Utils.Font_getHeight(TEXT_FONT);
SCREEN_FRAMED_WIDTH = SCREEN_WIDTH-(2*FRAME_SIZE);
SCREEN_FRAMED_HEIGHT = SCREEN_HEIGHT-(2*FRAME_SIZE);
}
// Creates a background drawable for the control layout including the different coloured panels and the next page arrows
public void paintControls(){
// Calculated layout values
int panelWidth = SIDE_ARROW_WIDTH*3, textViewHeight = (SCREEN_HEIGHT-SIDE_ARROW_HEIGHT)/2;
int leftArrowX = (SCREEN_WIDTH/8)+(SIDE_ARROW_WIDTH/3), rightArrowX = SCREEN_WIDTH-(SCREEN_WIDTH/4)+(SCREEN_WIDTH/8)-(SIDE_ARROW_WIDTH/3), arrowY = (SCREEN_HEIGHT/2)-(SIDE_ARROW_HEIGHT/2);
// Rect array that stores the bounds of each layer of the background
Rect [] bounds = new Rect[3];
int i = 0;
// background
ShapeDrawable background = new ShapeDrawable(new RectShape());
bounds[i++] = new Rect(0,0,SCREEN_WIDTH,SCREEN_HEIGHT);
background.getPaint().setColor(CONTROLS_BACKGROUND_COLOR);
// left panel
ShapeDrawable leftPanel = new ShapeDrawable(new RectShape());
bounds[i++] = new Rect(0, 0, panelWidth, SCREEN_HEIGHT);
leftPanel.getPaint().setColor(CONTROLS_PANEL_COLOR);
// right arrow
Path rightArrowPath = new Path();
rightArrowPath.moveTo(SIDE_ARROW_WIDTH, SIDE_ARROW_HEIGHT/2);
rightArrowPath.lineTo(0, SIDE_ARROW_HEIGHT);
rightArrowPath.lineTo(0, 0);
rightArrowPath.lineTo(SIDE_ARROW_WIDTH, SIDE_ARROW_HEIGHT/2);
rightArrowPath.close();
ShapeDrawable rightArrow = new ShapeDrawable(new PathShape(rightArrowPath, SIDE_ARROW_WIDTH, SIDE_ARROW_HEIGHT));
bounds[i++] = new Rect(rightArrowX, arrowY, rightArrowX+SIDE_ARROW_WIDTH, arrowY+SIDE_ARROW_HEIGHT);
rightArrow.getPaint().setColor(CONTROLS_ARROW_COLOR);
Drawable [] layers = new Drawable[] { background, leftPanel, rightArrow };
LayerDrawable controlsBackground = new LayerDrawable(layers);
controlsBackground.setBounds(0,0,SCREEN_WIDTH,SCREEN_HEIGHT);
// set the bounds of each layer
for (i=0;i<controlsBackground.getNumberOfLayers();i++) {
controlsBackground.getDrawable(i).setBounds(bounds[i]);
}
controlsBackground.setAlpha(100);
controlsLayout.setBackgroundDrawable(controlsBackground);
controlsLayout.setVisibility(View.VISIBLE);
}
}
该活动被称为ControlsOverlayActivity.java，看起来像：
The activity is called ControlsOverlayActivity.java and looks like:
public class ControlsOverlayActivity extends Activity {
private ControlsOverlayView overlay;
private static WattpadApp appState;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.controls_overlay);
// initialize the controls overlay
ControlsOverlayView.controlsLayout = (LinearLayout) findViewById(R.id.controls_layout);
ControlsOverlayView.controlsLayout.setOnClickListener(controlsListener);
ControlsOverlayView.controlsTextViews = new TextView[] {
(TextView) findViewById(R.id.controls_text_left_above),
(TextView) findViewById(R.id.controls_text_right_above),
(TextView) findViewById(R.id.controls_text_middle),
(TextView) findViewById(R.id.controls_text_left_below),
(TextView) findViewById(R.id.controls_text_right_below)
};
// initialize the fade in/out animations for the controls overlay
ControlsOverlayView.controlsFadeIn = new AlphaAnimation(0,1);
ControlsOverlayView.controlsFadeIn.setDuration(ControlsOverlayView.CONTROLS_FADE_DURATION);
ControlsOverlayView.controlsFadeOut = new AlphaAnimation(1,0);
ControlsOverlayView.controlsFadeOut.setDuration(ControlsOverlayView.CONTROLS_FADE_DURATION);
ControlsOverlayView.controlsFadeOut.setAnimationListener(new AnimationListener(){
public void onAnimationEnd(Animation animation) {
//ControlsOverlayView.controlsLayout.setVisibility(View.GONE);
}
public void onAnimationRepeat(Animation animation) {}
public void onAnimationStart(Animation animation) {}
});
}
private OnClickListener controlsListener = new OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
};
}
和XML文件被称为controls_overlay.xml，看起来像：
And the xml file is called controls_overlay.xml and looks like:
<?xml version="1.0" encoding="utf-8"?>
<!-- Controls Overlay -->
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/controls_overlay"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<wp.wattpad.ui.ControlsOverlayView
android:layout_width="1dp"
android:layout_height="1dp"
/>
<LinearLayout
android:id="@+id/controls_layout"
android:orientation="horizontal"
android:visibility="invisible"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<!-- Left Panel -->
<LinearLayout
android:orientation="vertical"
android:gravity="left"
android:layout_width="wrap_content"
android:layout_height="fill_parent" >
<TextView android:id="@+id/controls_text_left_above"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal|bottom"
android:text="@string/controls_prevpage" />
<TextView android:id="@+id/controls_text_left_below"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal|top"
android:text="@string/controls_scrollslower" />
</LinearLayout>
<!-- Middle Panel -->
<LinearLayout
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="fill_parent" >
<TextView android:id="@+id/controls_text_middle"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_horizontal|center_vertical"
android:text="@string/taptoscroll" />
</LinearLayout>
<!-- Right Panel -->
<LinearLayout
android:orientation="vertical"
android:gravity="right"
android:layout_width="wrap_content"
android:layout_height="fill_parent" >
<TextView android:id="@+id/controls_text_right_above"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal|bottom"
android:text="@string/controls_nextpage" />
<TextView android:id="@+id/controls_text_right_below"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_horizontal|top"
android:text="@string/controls_scrollfaster" />
</LinearLayout>
</LinearLayout>
我真的坚持在这里，我想知道，也许叫调整，并从的onDraw paint（）方法是不是做的最好的地方，但是我不知道还有什么地方我能做到这一点，因为我需要知道高度与屏幕的宽度。我也试图调用super.onDraw（），它didn`t改变什么走动。
I am really stuck here and I am wondering if maybe calling resize and paint from the onDraw() method is not the best place to do it, however I am not sure where else I could do it since I need to know the height and width of the screen. I have also tried moving around the call to super.onDraw() which didn`t change anything.
推荐答案
发现了几个令人沮丧小时后答案。我打电话调整（）并调整其大小（canvas.getWidth（），canvas.getHeight（））;它应该是controlsLayout.getWidth（）和controlsLayout.getHeight（）。即使在画布高度的高度为离视图的高度它被完全无视界限的几个像素。不知道为什么是这样的话，这是严重令人沮丧，但问题就迎刃而解了。
Found the answer after several frustrating hours. I was calling resize() with resize(canvas.getWidth(), canvas.getHeight()); and it should have been controlsLayout.getWidth() and controlsLayout.getHeight(). Even though the height of the canvas height was a few pixels off of the view's height it was completely ignoring the bounds. No idea why this is the case and it is severely frustrating, but problem solved.
这篇关于凡设置绘制的边界自定义视图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
