這篇文章給大家介紹RationBar控件怎么在Android中使用，內(nèi)容非常詳細(xì)，感興趣的小伙伴們可以參考借鑒，希望對大家能有所幫助。
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public class SuperRationBar extends View implements View.OnTouchListener {
final public static int MIXED = 0;
final public static int SCROLL = 1;
//不傳默認(rèn)為 MIXED
private int mode = MIXED;
// 需要建立多少星星 不傳 默認(rèn)為5
private int number = 5;
// 單個(gè)星星的寬度 這里寬度和高度相等 必傳
private int startWidth = 50;
// 每個(gè)星星之間的間距 默認(rèn)20 (mode == MIXED 用不到)
private int startPadding = 10;
//是否已經(jīng)初始化試圖
private boolean isInit = false;
//被選中的個(gè)數(shù)
private int selectNumber = 0;
//選中的樣式
private Bitmap bmSel;
//未選中的樣式
private Bitmap bmNol;
//記錄每個(gè)星星的位置 用 , 分割
private List pointList;
// 畫筆
private Paint mPaint;
public SuperRationBar(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs);
init(context);
}
private void init(Context context) {
mPaint = new Paint();
setOnTouchListener(this);
}
private void init(Context context, AttributeSet attrs) {
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.SuperRationBar);
mode = a.getInteger(R.styleable.SuperRationBar_mode, MIXED);
number = a.getInteger(R.styleable.SuperRationBar_SuperRationBar_number, 5);
startWidth = (int) a.getDimension(R.styleable.SuperRationBar_SuperRationBar_startWidth, 50);
startPadding = (int) a.getDimension(R.styleable.SuperRationBar_SuperRationBar_startPadding, 10);
a.recycle();
}
@Override
public void draw(Canvas canvas) {
super.draw(canvas);
if (!isInit) {
return;
}
{//記錄每個(gè)星星的位置 用 , 分割
pointList = new ArrayList<>();
}
if (mode == MIXED) {
//單個(gè)星星的寬度
int itemWidth = getWidth() / number;
//根據(jù)每個(gè)星星之間的間距畫星星
for (int i = 0; i < number; i++) {
int left = i == 0 ? 0 : itemWidth * i;
int height = getHeight();
int bmHeight = bmSel.getHeight();
int top = (getHeight() - startWidth) / 2;
pointList.add(left + "," + top + "," + (left + itemWidth) + "," + (top + itemWidth));
if (i < selectNumber) {
canvas.drawBitmap(bmSel, left, top, mPaint);
} else {
canvas.drawBitmap(bmNol, left, top, mPaint);
}
}
} else if (mode == SCROLL) {
int totalWidth = (startWidth + startPadding) * (number - 1) + startWidth;
//單個(gè)星星的寬度
int itemWidth = totalWidth / number;
//根據(jù)每個(gè)星星之間的間距畫星星
for (int i = 0; i < number; i++) {
int left = i == 0 ? 0 : itemWidth * i;
int top = (getHeight() - startWidth) / 2;
pointList.add(left + "," + top + "," + (left + itemWidth) + "," + (top + itemWidth));
if (i < selectNumber) {
canvas.drawBitmap(bmSel, left, top, mPaint);
} else {
canvas.drawBitmap(bmNol, left, top, mPaint);
}
}
}
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
isInit = true;
}
/**
* 設(shè)置三種圖片樣式的id
*
* @param selId
* @param nolId
*/
public SuperRationBar setImageResIds(int selId, int nolId) {
bmSel = BitmapFactory.decodeResource(getResources(), selId);
bmNol = BitmapFactory.decodeResource(getResources(), nolId);
bmSel = zoomBitmap(bmSel, startWidth);
bmNol = zoomBitmap(bmNol, startWidth);
return this;
}
/**
* 調(diào)用這個(gè)方法刷新頁面
*/
public void launcher() {
if (isInit) {
postInvalidate();
} else {
post(new Runnable() {
@Override
public void run() {
postInvalidate();
}
});
}
}
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN
|| event.getAction() == MotionEvent.ACTION_MOVE) {
if (pointList != null) {
int num = contain((int) event.getX(), (int) event.getY());
if (num != -1) {
selectNumber = num + 1;
}
postInvalidate();
}
if (event.getAction() == MotionEvent.ACTION_DOWN) {
return true;
}
}
return false;
}
/**
* 判斷點(diǎn)擊的位置是不是在星星上邊 并返回星星的下標(biāo) 錯(cuò)誤 返回-1
*
* @param x
* @param y
* @return
*/
private int contain(int x, int y) {
int size = pointList.size();
for (int i = 0; i < size; i++) {
String[] pointArray = pointList.get(i).split(",");
int rl = Integer.parseInt(pointArray[0]);
int rt = Integer.parseInt(pointArray[1]);
int rr = Integer.parseInt(pointArray[2]);
int rb = Integer.parseInt(pointArray[3]);
if (x > rl && x < rr) {
//在范圍內(nèi) 返回下標(biāo)
return i;
}
}
return -1;
}
public int getSelectNumber() {
return selectNumber;
}
/**
* 等比例縮放bitmap圖片
*
* @param bitmap
* @param reqWidth
* @return
*/
public Bitmap zoomBitmap(Bitmap bitmap, float reqWidth) {
if (bitmap == null) {
return null;
}
final int width = bitmap.getWidth();
Matrix matrix = new Matrix();
float scale = reqWidth / width;
matrix.setScale(scale, scale);
bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(),
bitmap.getHeight(), matrix, true);
return bitmap;
}
} 
