#文件创建
##创建自定义文件
说明：当系统的控件不满足需求时，自行定义控件，设置所要的控件效果
步骤 ： File -> UI Component --> Custom View
示例代码：
1. ChangeColorIconWithText.java文件
~~~
package com.sowsceo.www.customizecontrol;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.view.View;
import com.sowsceo.www.suityou.R;
/**
* TODO: document your custom view class.
*/
public class ChangeColorIconWithText extends View {
private String mExampleString; // TODO: use a default from R.string...
private int mExampleColor = Color.RED; // TODO: use a default from R.color...
private float mExampleDimension = 0; // TODO: use a default from R.dimen...
private Drawable mExampleDrawable;
private TextPaint mTextPaint;
private float mTextWidth;
private float mTextHeight;
public ChangeColorIconWithText(Context context) {
super(context);
init(null, 0);
// this(context,null);
}
public ChangeColorIconWithText(Context context, AttributeSet attrs) {
super(context, attrs);
init(attrs, 0);
//this(context,attrs,0);
}
/**
* 获取自定义属性的值
*
* @param context
* @param attrs
* @param defStyle
*/
public ChangeColorIconWithText(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(attrs, defStyle);
}
private void init(AttributeSet attrs, int defStyle) {
// Load attributes
final TypedArray a = getContext().obtainStyledAttributes(
attrs, R.styleable.ChangeColorIconWithText, defStyle, 0);
mExampleString = a.getString(
R.styleable.ChangeColorIconWithText_exampleString);
mExampleColor = a.getColor(
R.styleable.ChangeColorIconWithText_exampleColor,
mExampleColor);
// Use getDimensionPixelSize or getDimensionPixelOffset when dealing with
// values that should fall on pixel boundaries.
mExampleDimension = a.getDimension(
R.styleable.ChangeColorIconWithText_exampleDimension,
mExampleDimension);
if (a.hasValue(R.styleable.ChangeColorIconWithText_exampleDrawable)) {
mExampleDrawable = a.getDrawable(
R.styleable.ChangeColorIconWithText_exampleDrawable);
mExampleDrawable.setCallback(this);
}
a.recycle();
// Set up a default TextPaint object
mTextPaint = new TextPaint();
mTextPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
mTextPaint.setTextAlign(Paint.Align.LEFT);
// Update TextPaint and text measurements from attributes
invalidateTextPaintAndMeasurements();
}
private void invalidateTextPaintAndMeasurements() {
mTextPaint.setTextSize(mExampleDimension);
mTextPaint.setColor(mExampleColor);
mTextWidth = mTextPaint.measureText(mExampleString);
Paint.FontMetrics fontMetrics = mTextPaint.getFontMetrics();
mTextHeight = fontMetrics.bottom;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
// TODO: consider storing these as member variables to reduce
// allocations per draw cycle.
int paddingLeft = getPaddingLeft();
int paddingTop = getPaddingTop();
int paddingRight = getPaddingRight();
int paddingBottom = getPaddingBottom();
int contentWidth = getWidth() - paddingLeft - paddingRight;
int contentHeight = getHeight() - paddingTop - paddingBottom;
// Draw the text.
canvas.drawText(mExampleString,
paddingLeft + (contentWidth - mTextWidth) / 2,
paddingTop + (contentHeight + mTextHeight) / 2,
mTextPaint);
// Draw the example drawable on top of the text.
if (mExampleDrawable != null) {
mExampleDrawable.setBounds(paddingLeft, paddingTop,
paddingLeft + contentWidth, paddingTop + contentHeight);
mExampleDrawable.draw(canvas);
}
}
/**
* Gets the example string attribute value.
*
* @return The example string attribute value.
*/
public String getExampleString() {
return mExampleString;
}
/**
* Sets the view's example string attribute value. In the example view, this string
* is the text to draw.
*
* @param exampleString The example string attribute value to use.
*/
public void setExampleString(String exampleString) {
mExampleString = exampleString;
invalidateTextPaintAndMeasurements();
}
/**
* Gets the example color attribute value.
*
* @return The example color attribute value.
*/
public int getExampleColor() {
return mExampleColor;
}
/**
* Sets the view's example color attribute value. In the example view, this color
* is the font color.
*
* @param exampleColor The example color attribute value to use.
*/
public void setExampleColor(int exampleColor) {
mExampleColor = exampleColor;
invalidateTextPaintAndMeasurements();
}
/**
* Gets the example dimension attribute value.
*
* @return The example dimension attribute value.
*/
public float getExampleDimension() {
return mExampleDimension;
}
/**
* Sets the view's example dimension attribute value. In the example view, this dimension
* is the font size.
*
* @param exampleDimension The example dimension attribute value to use.
*/
public void setExampleDimension(float exampleDimension) {
mExampleDimension = exampleDimension;
invalidateTextPaintAndMeasurements();
}
/**
* Gets the example drawable attribute value.
*
* @return The example drawable attribute value.
*/
public Drawable getExampleDrawable() {
return mExampleDrawable;
}
/**
* Sets the view's example drawable attribute value. In the example view, this drawable is
* drawn above the text.
*
* @param exampleDrawable The example drawable attribute value to use.
*/
public void setExampleDrawable(Drawable exampleDrawable) {
mExampleDrawable = exampleDrawable;
}
}
~~~
2. sample_change_color_icon_with_text.xml 文件
注意： 需要编写命名空间
写法： xmlns:app="http://schemas.android.com/apk/自己定义的完整包名"
示例： xmlns:app="http://schemas.android.com/apk/com.sowsceo.www.customizecontrol"
~~~
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/com.sowsceo.www.customizecontrol"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.sowsceo.www.customizecontrol.ChangeColorIconWithText
android:layout_width="300dp"
android:layout_height="300dp"
android:background="#ccc"
android:paddingBottom="40dp"
android:paddingLeft="20dp"
app:exampleColor="#33b5e5"
app:exampleDimension="24sp"
app:exampleDrawable="@android:drawable/ic_menu_add"
app:exampleString="Hello, ChangeColorIconWithText" />
</FrameLayout>
~~~
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