我有一个自定义 View ...
package nan.salsa.goal.customview;
import android.R;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.RectShape;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
public class DayView extends View {
private static String TAG="DayView";
private ShapeDrawable mDrawable;
public DayView(Context context) {
super(context);
}
public DayView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public DayView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
public void init() {
int x = 10;
int y = 10;
int width = 300;
int height = 300;
mDrawable = new ShapeDrawable(new RectShape());
mDrawable.getPaint().setColor(0xff74AC23);
mDrawable.setBounds(x, y, x + width, y + height);
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
setBackgroundColor(R.color.black);
mDrawable.draw(canvas);
}
}
使用这个简单的配置文件:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:background="#E06F00">
<nan.salsa.goal.customview.DayView android:id="@+id/dayView"
android:layout_height="match_parent"
android:layout_width="fill_parent" />
</LinearLayout>
在我看来,我想动态地设置矩形的宽度...
我试过了:
View parent = getParent();
int width = parent.getWidth();
//抛出 nullPointerException 因为 parent 为 null ...
还有:
getRootView().getWidth();
//在这种情况下没有 null pointerException 但方法返回 0:
我该怎么做?
问候
安东尼奥·穆塞拉
最佳答案
通过将此方法添加到您的自定义 View 类:
@Override
public void onSizeChanged (int w, int h, int oldw, int oldh){
super.onSizeChanged(w, h, oldw, oldh);
screenW = w;
screenH = h;
}
关于android - 我如何从自定义 View 中获取宽度和高度尺寸?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5091849/