ChekBox的用途我们就不必多说了,算是一个很古老的控件了,何其类似的还有RadioButton,这个东西因为我目前还没写出来,所以用了别人的一个lib,这下面会说到。顺便说一句,如果你的app是在5.0环境下编译的,那么你用传统的checkbox时,你会发现checkbox在低版本机子上运行出来的样子和以前不同了,虽然没有动画效果,但样子和5.0以上的checkbox还是很像的。
最小尺寸
48 x 48
开源lib中对于不同的屏幕做了不同大小的对勾图片,应该能满足高清屏的要求。至于不可用状态目前还没做,其实也就是继承下isEnable()方法,但是因为做出来的效果我不是很满意,所以就仅仅试了试,没真的放出来。
一、导入到自己的工程中
要用这个控件还是得添加开源项目的支持,开源项目地址:
我维护的:https://github.com/shark0017/MaterialDesignLibrary
原版本:https://github.com/navasmdc/MaterialDesignLibrary
大家可以选择一个下载,反正两个版本都是我和原作者融合后的东西,差别不大。
添加lib支持后我们就可以用这个控件了,放入布局文件前还是要写命名空间的。
xmlns:app="http://schemas.android.com/apk/res-auto"
<com.gc.materialdesign.views.CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal" />
由于我没有做可视化的效果,所以在编译器中没办法实时显示状态,默认就是一个透明的view。如果大家想在编译器中看个大概的样子,可以给它通过background=“#xxxxxx”添加个背景颜色。
真实运行的效果:
二、在布局文件中设定各种属性
app:checked="true" 是否被选中,默认没被选中
android:background="#ff0000" 设定checkbox的颜色,默认是绿色
android:layout_width="100dp" 设定checkbox这个view整体的大小,和里面的方框无关。注意看图中按压时阴影的大小
android:layout_height="100dp"
app:checkBoxSize="40dp" 设定checkbox里面方框的大小
三、通过代码设定各种属性
public class CheckBoxTest extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.checkbox);
CheckBox checkBox = (CheckBox)findViewById(R.id.checkBox01);
checkBox.setChecked(true);// 设定初始为选中的状态
checkBox.setBackgroundColor(0xffff0000);// 设置checkbox的颜色
checkBox.setBackgroundColor(getResources().getColor(R.color.orange));// 设置背景色
checkBox.setCheckBoxSize(35.5f);// 设置方框的大小
// 监听选中的事件
checkBox.setOncheckListener(new OnCheckListener() {
@Override
public void onCheck(boolean isChecked) {
// TODO 自动生成的方法存根
System.out.println("isChecked = "+ checkBox05.isChecked());
Toast.makeText(CheckBoxTest.this, "checkbox status = "+isChecked, 0).show();
}
});
}
}
四、补充:RadioButton
这个控件是从另一个开源项目中得到的,那个lib中其他的控件都做的不好,就这个做的十分精细。具体的测试和修改我没去做,下面仅仅给出源码,由大家自行修改吧,其实可以修改的地方还是蛮多的。
lib地址:https://github.com/keithellis/MaterialWidget
源码如下:
dimen.xml
这里是默认的属性,包括长宽啥的,这些值照理说都应该可以在java代码中定制的。
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!-- RadioButton Default -->
<dimen name="radio_width">48dp</dimen>
<dimen name="radio_height">48dp</dimen>
<dimen name="radio_border_radius">10dp</dimen>
<dimen name="radio_thumb_radius">6dp</dimen>
<dimen name="radio_ripple_radius">24dp</dimen>
<dimen name="radio_stroke_width">2dp</dimen>
<color name="radio_color">#6d6d6d</color>
<color name="radio_checked_color">#55b03d</color>
</resources>
可以定制的属性,这里就两个,蛮少的。请大家自行添加修改吧~
<!-- RadioButton Attribute -->
<declare-styleable name="RadioButton">
<attr name="radio_color" format="color"/>
<attr name="radio_checked_color" format="color"/>
</declare-styleable>
RadioButton.java
从中我们可以看到,这个控件都是被画出来的,和上面控件用到的lib的构建思路不同。因为是画出来的,所以我们可以定制的东西更多,扩展性更强,值得细细品味这个类的写法。
package com.gc.materialdesign.views;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.CompoundButton;
import com.gc.materialdesign.R;
/**
* Created by IntelliJ IDEA.
* User: keith.
* Date: 14-10-8.
* Time: 15:48.
*/
public class RadioButton extends CompoundButton {
private static final long ANIMATION_DURATION = 200;// 动画持续的时间
private static final int StateNormal = 1;
private static final int StateTouchDown = 2;
private static final int StateTouchUp = 3;
private int mState = StateNormal;
private long mStartTime;
private int mColor;
private int mCheckedColor;
private int mRadioWidth;// 宽度
private int mRadioHeight;// 高度
private int mBorderRadius;
private int mThumbRadius;
private int mRippleRadius;
private int mStrokeWidth;
private Rect mFingerRect;
private boolean mMoveOutside;
private Paint borderPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private Paint thumbPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
private Paint ripplePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
public RadioButton(Context context) {
this(context, null);
}
public RadioButton(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public RadioButton(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray attributes = context.obtainStyledAttributes(attrs, R.styleable.RadioButton);
mColor = attributes.getColor(R.styleable.RadioButton_radio_color, getResources().getColor(R.color.radio_color));
mCheckedColor = attributes.getColor(R.styleable.RadioButton_radio_checked_color, getResources().getColor(R.color.radio_checked_color));
attributes.recycle();
mRadioWidth = getResources().getDimensionPixelSize(R.dimen.radio_width);
mRadioHeight = getResources().getDimensionPixelSize(R.dimen.radio_height);
mBorderRadius = getResources().getDimensionPixelSize(R.dimen.radio_border_radius);
mThumbRadius = getResources().getDimensionPixelSize(R.dimen.radio_thumb_radius);
mRippleRadius = getResources().getDimensionPixelSize(R.dimen.radio_ripple_radius);
mStrokeWidth = getResources().getDimensionPixelSize(R.dimen.radio_stroke_width);
thumbPaint.setColor(mCheckedColor);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
widthMeasureSpec = MeasureSpec.makeMeasureSpec(measureWidth(widthMeasureSpec), MeasureSpec.EXACTLY);
heightMeasureSpec = MeasureSpec.makeMeasureSpec(measureHeight(heightMeasureSpec), MeasureSpec.EXACTLY);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
private int measureWidth(int measureSpec) {
int result;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if (specMode == MeasureSpec.EXACTLY) {
if (specSize < mRadioWidth) {
result = mRadioWidth;
} else {
result = specSize;
}
} else {
result = mRadioWidth;
}
return result;
}
private int measureHeight(int measureSpec) {
int result;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if (specMode == MeasureSpec.EXACTLY) {
if (specSize < mRadioHeight) {
result = mRadioHeight;
} else {
result = specSize;
}
} else {
result = mRadioHeight;
}
return result;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (isEnabled()) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mMoveOutside = false;
mState = StateTouchDown;
mFingerRect = new Rect(getLeft(), getTop(), getRight(), getBottom());
mStartTime = System.currentTimeMillis();
invalidate();
break;
case MotionEvent.ACTION_MOVE:
if (!mFingerRect.contains(getLeft() + (int) event.getX(), getTop() + (int) event.getY())) {
mMoveOutside = true;
mState = StateNormal;
mStartTime = System.currentTimeMillis();
invalidate();
}
break;
case MotionEvent.ACTION_UP:
if (!mMoveOutside) {
mState = StateTouchUp;
setChecked(!isChecked());
mStartTime = System.currentTimeMillis();
invalidate();
}
break;
case MotionEvent.ACTION_CANCEL:
mState = StateNormal;
invalidate();
break;
}
}
return true;
}
private int rippleColor(int color) {
int alpha = Math.round(Color.alpha(color) * 0.2f);
int red = Color.red(color);
int green = Color.green(color);
int blue = Color.blue(color);
return Color.argb(alpha, red, green, blue);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int rippleRadius = 0;
int thumbRadius = isChecked() ? mThumbRadius : 0;
long elapsed = System.currentTimeMillis() - mStartTime;
switch (mState) {
case StateNormal:
break;
case StateTouchDown:
ripplePaint.setAlpha(255);
if (elapsed < ANIMATION_DURATION) {
rippleRadius = Math.round(elapsed * mRippleRadius / ANIMATION_DURATION);
} else {
rippleRadius = mRippleRadius;
}
postInvalidate();
break;
case StateTouchUp:
if (elapsed < ANIMATION_DURATION) {
int alpha = Math.round((ANIMATION_DURATION - elapsed) * 255 / ANIMATION_DURATION);
ripplePaint.setAlpha(alpha);
rippleRadius = Math.round((ANIMATION_DURATION - elapsed) * mRippleRadius / ANIMATION_DURATION);
if (isChecked()) {
thumbRadius = Math.round(elapsed * mThumbRadius / ANIMATION_DURATION);
} else {
thumbRadius = Math.round((ANIMATION_DURATION - elapsed) * mThumbRadius / ANIMATION_DURATION);
}
} else {
mState = StateNormal;
rippleRadius = 0;
ripplePaint.setAlpha(0);
}
postInvalidate();
break;
}
if (isChecked()) {
ripplePaint.setColor(rippleColor(mCheckedColor));
borderPaint.setColor(mCheckedColor);
borderPaint.setStyle(Paint.Style.STROKE);
borderPaint.setStrokeWidth(mStrokeWidth);
} else {
ripplePaint.setColor(rippleColor(mColor));
borderPaint.setColor(mColor);
borderPaint.setStyle(Paint.Style.STROKE);
borderPaint.setStrokeWidth(mStrokeWidth);
}
canvas.drawCircle(getWidth() / 2, getHeight() / 2, rippleRadius, ripplePaint);
canvas.drawCircle(getWidth() / 2, getHeight() / 2, mBorderRadius, borderPaint);
canvas.drawCircle(getWidth() / 2, getHeight() / 2, thumbRadius, thumbPaint);
}
}