自定义EditText_password输入框

创建一个类继承EditTextimport android.annotation.SuppressLint;import android.content.Context;import android.graphics.drawable.Drawable;import android.support.v4.content.ContextCompat;import android.text.Editable;import android.text.Selection;import android.text.Spannable;import android.text.TextWatcher;import android.text.method.HideReturnsTransformationMethod;import android.text.method.PasswordTransformationMethod;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.view.animation.Animation;import android.view.animation.CycleInterpolator;import android.view.animation.TranslateAnimation;import android.widget.EditText;import com.example.ztz.android_timer.R;/** * Created by ztz on 2017/12/19. * 自定义EditText_password输入框 */@SuppressLint("AppCompatCustomView")public class PasswordEditText extends EditText implements View.OnFocusChangeListener, TextWatcher {    private Drawable mToggleDrawable;    public PasswordEditText(Context context) {        super(context);    }    public PasswordEditText(Context context, AttributeSet attrs) {        super(context, attrs);        init();        //进入页面默认设置密文格式        setTransformationMethod(PasswordTransformationMethod.getInstance());    }    public PasswordEditText(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();        //进入页面默认设置密文格式        setTransformationMethod(PasswordTransformationMethod.getInstance());    }    /**     * 初始化小眼睛控件     */    private void init() {        //获取EditText的DrawableRight,主要是通过xml或者外部设置右边的按钮，如果没有设置就采用默认的        mToggleDrawable = getCompoundDrawables()[2];        if (mToggleDrawable == null) {            mToggleDrawable = ContextCompat.getDrawable(getContext(), R.drawable.zhengyan);        }        mToggleDrawable.setBounds(0, 0, mToggleDrawable.getIntrinsicWidth(), mToggleDrawable.getIntrinsicHeight());        setToggleIconVisible(false);        setOnFocusChangeListener(this);        addTextChangedListener(this);    }    /**     * 因为我们不能直接给EditText设置点击事件，所以我们用记住我们按下的位置来模拟点击事件     * 当我们按下的位置 在  EditText的宽度 - 图标到控件右边的间距 - 图标的宽度  和     * EditText的宽度 - 图标到控件右边的间距之间我们就算点击了图标，竖直方向没有考虑     */    @Override    public boolean onTouchEvent(MotionEvent event) {        if (getCompoundDrawables()[2] != null) {            if (event.getAction() == MotionEvent.ACTION_DOWN) {                boolean touchable = event.getX() > (getWidth()                        - getPaddingRight() - mToggleDrawable.getIntrinsicWidth())                        && (event.getX() < ((getWidth() - getPaddingRight())));                if (touchable) {                    //显示密码明文                    setTransformationMethod(HideReturnsTransformationMethod.getInstance());                    postInvalidate();                    CharSequence charSequence = getText();                    //为了保证体验效果，需要保持输入焦点在文本最后一位                    if (charSequence != null) {                        Spannable spanText = (Spannable) charSequence;                        Selection.setSelection(spanText, charSequence.length());                    }                }            }else if(event.getAction() == MotionEvent.ACTION_UP){                //隐藏密码明文                setTransformationMethod(PasswordTransformationMethod.getInstance());                postInvalidate();                setSelection(getText().length());            }        }        return super.onTouchEvent(event);    }    /**     * 当EditText焦点发生变化的时候，判断里面字符串长度设置图标的显示与隐藏     */    @Override    public void onFocusChange(View v, boolean hasFocus) {        if (hasFocus) {            setToggleIconVisible(getText().length() > 0);        } else {            setToggleIconVisible(false);        }    }    /**     * 设置图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去     * @param visible     */    public void setToggleIconVisible(boolean visible) {        Drawable right = visible ? mToggleDrawable : null;        setCompoundDrawables(getCompoundDrawables()[0],                getCompoundDrawables()[1], right, getCompoundDrawables()[3]);    }    /**     * 当输入框里面内容发生变化的时候回调的方法     */    @Override    public void onTextChanged(CharSequence s, int start, int count,int after) {        setToggleIconVisible(s.length() > 0);    }    @Override    public void beforeTextChanged(CharSequence s, int start, int count,int after) {    }    @Override    public void afterTextChanged(Editable s) {    }}