接下来我们再按如果通过代码来定义控件，这里需要了解的一个知识点，如果我们需要在我们的自定义控件如果新添属于我们自己的属性呢？这里我就们就需要attr.xml文件中自己定义，关于这方面的知识大家可以参考这篇文章：
我们先看我们自己定义的控件定义新增的如下几个属性：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable>
<attr format="string" />
<attr format="string" />
<attr format="string" />
<attr format="reference"></attr>
<attr format="reference"></attr>
</declare-styleable>
</resources>
再看我们的自定义控件的代码中如何写的：
public class UINavigationView extends LinearLayout {
private Button btn_left;
private Button btn_right;
private TextView tv_title;
private String strBtnLeft;
private String strBtnRight;
private String strTitle;
private int left_drawable;
private int right_drawable;
public UINavigationView(Context context) {
super(context);
initContent();
}
public UINavigationView(Context context, AttributeSet attrs) {
super(context, attrs);
initAttributes(attrs);
initContent();
}
private void initAttributes(AttributeSet attributeSet) {
if (null != attributeSet) {
final int attrIds[] = new int[] { R.attr.btn_leftText,
R.attr.btn_rightText, R.attr.tv_title,
R.attr.left_drawable, R.attr.right_drawable };
Context context = getContext();
TypedArray array = context.obtainStyledAttributes(attributeSet,
attrIds);
CharSequence t1 = array.getText(0);
CharSequence t2 = array.getText(1);
CharSequence t3 = array.getText(2);
left_drawable = array.getResourceId(3, 0);
right_drawable = array.getResourceId(4, 0);
array.recycle();
if (null != t1) {
strBtnLeft = t1.toString();
}
if (null != t2) {
strBtnRight = t2.toString();
}
if (null != t3) {
strTitle = t3.toString();
}
Log.i("coder", "t1 = " + t1);
Log.i("coder", "t2 = " + t2);
Log.i("coder", "t3 = " + t3);
Log.i("coder", "left_res = " + left_drawable);
}
}
private void initContent() {
Log.i("coder", "-----initContent----");
// 设置水平方向
setOrientation(HORIZONTAL);
setGravity(Gravity.CENTER_VERTICAL);
// 设置背景
setBackgroundResource(R.drawable.navigation_bg);
Context context = getContext();
btn_left = new Button(context);
btn_left.setVisibility(View.INVISIBLE);// 设置设置不可见
if (left_drawable != 0) {
btn_left.setBackgroundResource(left_drawable);
} else {
btn_left.setBackgroundResource(R.drawable.backbg);// 设置背景
}
btn_left.setTextColor(Color.WHITE);// 字体颜色
if (null != strBtnLeft) {
LayoutParams btnLeftParams = new LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
btnLeftParams.setMargins(10, 0, 0, 0);
btn_left.setLayoutParams(btnLeftParams);
btn_left.setText(strBtnLeft);
btn_left.setVisibility(View.VISIBLE);
} else {
btn_left.setLayoutParams(new LayoutParams(50, 50));
}
// 添加这个按钮
addView(btn_left);
//
tv_title = new TextView(context);
LayoutParams centerParam = new LayoutParams(LayoutParams.FILL_PARENT,
LayoutParams.FILL_PARENT);
centerParam.weight = 1;
tv_title.setLayoutParams(centerParam);
tv_title.setTextColor(Color.WHITE);
if (null != strTitle) {
tv_title.setText(strTitle);
}
tv_title.setGravity(Gravity.CENTER);
btn_left.setVisibility(View.VISIBLE);
// 添加这个标题
addView(tv_title);
btn_right = new Button(context);
btn_right.setVisibility(View.INVISIBLE);// 设置设置不可见
btn_right.setBackgroundResource(R.drawable.buttonbg);// 设置背景
btn_right.setTextColor(Color.WHITE);// 字体颜色
if (right_drawable != 0) {
btn_right.setBackgroundResource(right_drawable);
} else {
btn_right.setBackgroundResource(R.drawable.backbg);// 设置背景
}
if (null != strBtnRight) {
LayoutParams btnRightParams = new LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
btnRightParams.setMargins(0, 0, 10, 0);
btn_right.setLayoutParams(btnRightParams);
btn_right.setText(strBtnRight);
btn_right.setVisibility(View.VISIBLE);
} else {
btn_right.setLayoutParams(new LayoutParams(50, 50));
}
// 添加这个按钮
addView(btn_right);
}
public Button getBtn_left() {
return btn_left;
}
public Button getBtn_right() {
return btn_right;
}
public TextView getTv_title() {
return tv_title;
}
public String getStrBtnLeft() {
return strBtnLeft;
}
public void setStrBtnLeft(String strBtnLeft) {
this.strBtnLeft = strBtnLeft;
}
public String getStrBtnRight() {
return strBtnRight;
}
public void setStrBtnRight(String strBtnRight) {
this.strBtnRight = strBtnRight;
}
public String getStrTitle() {
return strTitle;
}
public void setStrTitle(String strTitle) {
this.strTitle = strTitle;
}
public int getLeft_drawable() {
return left_drawable;
}
public void setLeft_drawable(int left_drawable) {
this.left_drawable = left_drawable;
}
public int getRight_drawable() {
return right_drawable;
}
public void setRight_drawable(int right_drawable) {
this.right_drawable = right_drawable;
}
}