開源庫 bouncyEditText解析，開源bouncyedittext

開源庫 bouncyEditText解析，開源bouncyedittext

轉載請註明出處：王亟亟的大牛之路
運行效果

如何使用？
在布局XML裡引用即可，如下：

 <com.mingle.BouncyEditText       android:layout_width="fill_parent"       android:hint="帳號"       android:text="255"       android:layout_height="wrap_content">       </com.mingle.BouncyEditText>

跟別的自訂控制項一樣操作。
只需要在項目包裡複製內貼BouncyEditText這個類和對應的一些資源檔即可，也可以Library相應的LIB包。

我們來讀下核心類：

public class BouncyEditText extends EditText {    private int hintColor=getResources().getColor(R.color.hint_color);    private Paint paint;    private Status status= Status.ANIMATION_NONE;    private String hintText;    private Interpolator animOutInterpolator;    private Interpolator animInInterpolator;    private float animInDuration=200.0f;    private float animOutDuration=260.0f;    private boolean isSetPadding=false;    private boolean isHasHint = false;    public BouncyEditText(Context context) {        super(context);    }    public BouncyEditText(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public BouncyEditText(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    private void init() {        paint=new Paint();        //初始化一些動畫效果        animOutInterpolator = new OvershootInterpolator(1.3f);        animInInterpolator = new DecelerateInterpolator();        if(getHint()!=null) {            isHasHint =true;            hintText = getHint().toString();            setHint("");        }//        if (!TextUtils.isEmpty(getText().toString())) {//            status = Status.ANIMATION_OUT;////        } else {//            status = Status.ANIMATION_IN;//        }    }    //版本相容    @TargetApi(Build.VERSION_CODES.LOLLIPOP)    public BouncyEditText(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {        super(context, attrs, defStyleAttr, defStyleRes);        init();    }    long startTime;    private String preString;    //繼承textview重寫的方法    @Override    protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {        super.onTextChanged(text, start, lengthBefore, lengthAfter);        if(!isHasHint){            return;        }        if(TextUtils.isEmpty(preString) != TextUtils.isEmpty( getText().toString())) {            if (!TextUtils.isEmpty(getText().toString())) {                status = Status.ANIMATION_OUT;            } else {                status = Status.ANIMATION_IN;            }            preString = (String) getText().toString();            startTime = System.currentTimeMillis();        }    }    @Override    public void setText(CharSequence text, BufferType type) {        super.setText(text, type);        if(TextUtils.isEmpty(text)){            text="";        }        preString= (String) text;    }    public void setHintText(String hintText) {        this.hintText = hintText;        isHasHint =true;        this.hintText = hintText;        setHint("");    }        //具體的畫一些效果啊，動作什麼的，我們用就行了。    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        if(!isHasHint){            return;        }        paint.set(getPaint());        paint.setAntiAlias(true);        paint.setColor(hintColor) ;        if(!isSetPadding) {            setPadding(getPaddingLeft(), getPaddingTop(), getPaddingRight() + (int) paint.measureText(hintText), getPaddingBottom());            isSetPadding=true;        }        float maxHintY = getBaseline();        switch (status){            case  ANIMATION_IN:                if(System.currentTimeMillis()-startTime<animInDuration                        ){                    float hintX=getCompoundPaddingLeft() + getScrollX()+(getWidth()-getCompoundPaddingRight()-getCompoundPaddingLeft())*(1- animInInterpolator.getInterpolation((System.currentTimeMillis()-startTime)/animInDuration));                    canvas.drawText(hintText,hintX,maxHintY,paint);                    postInvalidate();                }else{                    float hintX = getCompoundPaddingLeft();                    canvas.drawText(hintText, hintX, maxHintY, paint);                }                break;            case  ANIMATION_OUT:                if(System.currentTimeMillis()-startTime<animOutDuration                        ){                    float hintX=getCompoundPaddingLeft() + getScrollX()+(getWidth()-getCompoundPaddingRight()-getCompoundPaddingLeft())* animOutInterpolator.getInterpolation((System.currentTimeMillis()-startTime)/animOutDuration);                    canvas.drawText(hintText,hintX,maxHintY,paint);                    postInvalidate();                }else{                    float hintX=                            getScrollX()+(getWidth()-getCompoundPaddingRight());                    canvas.drawText(hintText, hintX, maxHintY, paint);                }                break;            case  ANIMATION_NONE:                if(getText().toString().length()==0){                    float hintX = getCompoundPaddingLeft() + getScrollX();                    canvas.drawText(hintText,hintX,maxHintY,paint);                }else{                    float hintX=                            getScrollX()+(getWidth()-getCompoundPaddingRight());                    canvas.drawText(hintText,hintX,maxHintY,paint);                }                break;        }    }    public enum  Status{        ANIMATION_IN,        ANIMATION_NONE,        ANIMATION_OUT    }}

color.xml

<resources>    <color name="hint_color">#9e9e9e</color></resources>

當然如果是伸手黨，就更簡單，複製上面的一堆，然後用就行了。很簡單，效果也不錯。

http://yunpan.cn/cQ74xshPWkExJ 訪問密碼 5597