BouncyEditText.java

package com.com.mr_wrong.CustomView;

import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Build;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Interpolator;
import android.view.animation.OvershootInterpolator;
import android.widget.EditText;

import com.Utils.LogUtils;
import com.example.mr_wrong.androidstudioproject.R;

/**
 * Created by Mr_Wrong on 15/8/20.
 */
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();

        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;
//        }

    }

    @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;

    @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();
            LogUtils.e(startTime);
        }
    }


    @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("");

    }

    @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://这是回到左边



                if (System.currentTimeMillis() - startTime < animInDuration
                        ) {
                    float hintX = getCompoundPaddingLeft() + getScrollX() + (getWidth() - getCompoundPaddingRight() - getCompoundPaddingLeft()) * (1 - animInInterpolator.getInterpolation((System.currentTimeMillis() - startTime) / animInDuration));

                    LogUtils.e(hintX);

                    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

    }
}