19.Android 清除按钮EditText - AIEditText
19.Android 清除按钮EditText - AIEditText
- Android 清除按钮EditText - AIEditText
- 实现思路
- 继承AppCompatEditText类
- setCompoundDrawables设置图片
- 实现OnFocusChangeListener接口
- 实现ViewOnTouchListener接口
- 实现TextWatcher接口
- AIEditText源码
- AIEditText效果图
- Github传送门
实现思路
1.继承AppCompatEditText类。
2.读取图片，每次都通过setCompoundDrawables将图片设置到EditText的右边。
3.实现OnFocusChangeListener接口，每次获得焦点的时候，进行一次文本的判断，如果有文本，显示图片；没有文本，隐藏图片。
4.实现View.OnTouchListener接口，每次onTouch的时候，判断是否点击到了图片，进行文本的清空。
5.实现TextWatcher接口，通过判断文本的长度，来决定图片是否显示。
继承AppCompatEditText类
public AIEditText(Context context) {
super(context);
this.init(context);
}
public AIEditText(Context context, AttributeSet attrs) {
super(context, attrs);
this.init(context);
}
public AIEditText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.init(context);
}setCompoundDrawables设置图片
从TextView继承下来的方法setCompoundDrawables。
EditText也是TextView的子类，AppCompatEditText又是EditText的子类。
setCompoundDrawables(@Nullable Drawable left, @Nullable Drawable top,
@Nullable Drawable right, @Nullable Drawable bottom)
/** * @param context */
private void init(Context context) {
Drawable drawable = ContextCompat.getDrawable(context, R.drawable.abc_ic_clear_mtrl_alpha);
Drawable wrappedDrawable = DrawableCompat.wrap(drawable);
DrawableCompat.setTint(wrappedDrawable, super.getCurrentHintTextColor());
this.mClearDrawable = wrappedDrawable;
this.mClearDrawable.setBounds(0, 0, this.mClearDrawable.getIntrinsicHeight(), this.mClearDrawable.getIntrinsicHeight());
this.setClearDrawableVisible(false);
super.setOnTouchListener(this);
super.setOnFocusChangeListener(this);
this.addTextChangedListener(this);
}
private void setClearDrawableVisible(boolean visible) {
this.mClearDrawable.setVisible(visible, false);
final Drawable[] compoundDrawables = this.getCompoundDrawables();
this.setCompoundDrawables(compoundDrawables[0], compoundDrawables[1], visible ? this.mClearDrawable : null, compoundDrawables[3]);
}实现OnFocusChangeListener接口
每次获得焦点的时候，进行一次文本的判断，如果有文本，显示图片；没有文本，隐藏图片。
/** * Called when the focus state of a view has changed. * * @param v The view whose state has changed. * @param hasFocus The new focus state of v. */
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus) {
this.setClearDrawableVisible(this.getText().length() > 0);
} else {
this.setClearDrawableVisible(false);
}
if (this.mOnFocusChangeListener != null)
this.mOnFocusChangeListener.onFocusChange(v, hasFocus);
}实现View.OnTouchListener接口
每次onTouch的时候，判断是否点击到了图片，进行文本的清空。
/** * @param v The view the touch event has been dispatched to. * @param event The MotionEvent object containing full information about * the event. * @return True if the listener has consumed the event, false otherwise. */
@Override
public boolean onTouch(View v, MotionEvent event) {
final int x = (int) event.getX();
/** * x > ableEditWidth (totalWidth - paddingRight - clearDrawableWidth ) * x > ableEditWidth == clearDrawable_X * so , when clearDrawable is visible and onClick it. */
if (this.mClearDrawable.isVisible() && x > this.getWidth() - this.getPaddingRight() - this.mClearDrawable.getIntrinsicWidth()) {
if (event.getAction() == MotionEvent.ACTION_UP) {
this.setError(null);
this.setText("");
}
return true;
}
return this.mOnTouchListener != null && this.mOnTouchListener.onTouch(v, event);
}实现TextWatcher接口
通过判断文本的长度，来决定图片是否显示。
/**
* @param text The text the TextView is displaying
* @param start The offset of the start of the range of the text that was
* modified
* @param lengthBefore The length of the former text that has been replaced
* @param lengthAfter The length of the replacement modified text
*/
@Override
public void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
if (isFocused()) this.setClearDrawableVisible(text.length() > 0);
}AIEditText源码
public class AIEditText extends AppCompatEditText implements View.OnTouchListener, View.OnFocusChangeListener, TextWatcher {
private Drawable mClearDrawable;
private OnFocusChangeListener mOnFocusChangeListener;
private OnTouchListener mOnTouchListener;
public AIEditText(Context context) {
super(context);
this.init(context);
}
public AIEditText(Context context, AttributeSet attrs) {
super(context, attrs);
this.init(context);
}
public AIEditText(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.init(context);
}
/** * Register a callback to be invoked when focus of this view changed. * * @param l The callback that will run. */
@Override
public void setOnFocusChangeListener(OnFocusChangeListener l) {
this.mOnFocusChangeListener = l;
}
/** * Register a callback to be invoked when a touch event is sent to this view. * * @param l the touch listener to attach to this view */
@Override
public void setOnTouchListener(OnTouchListener l) {
this.mOnTouchListener = l;
}
/** * @param context */
private void init(Context context) {
Drawable drawable = ContextCompat.getDrawable(context, R.drawable.abc_ic_clear_mtrl_alpha);
Drawable wrappedDrawable = DrawableCompat.wrap(drawable);
DrawableCompat.setTint(wrappedDrawable, super.getCurrentHintTextColor());
this.mClearDrawable = wrappedDrawable;
this.mClearDrawable.setBounds(0, 0, this.mClearDrawable.getIntrinsicHeight(), this.mClearDrawable.getIntrinsicHeight());
this.setClearDrawableVisible(false);
super.setOnTouchListener(this);
super.setOnFocusChangeListener(this);
this.addTextChangedListener(this);
}
private void setClearDrawableVisible(boolean visible) {
this.mClearDrawable.setVisible(visible, false);
final Drawable[] compoundDrawables = this.getCompoundDrawables();
this.setCompoundDrawables(compoundDrawables[0], compoundDrawables[1], visible ? this.mClearDrawable : null, compoundDrawables[3]);
}
/** * @param v The view the touch event has been dispatched to. * @param event The MotionEvent object containing full information about * the event. * @return True if the listener has consumed the event, false otherwise. */
@Override
public boolean onTouch(View v, MotionEvent event) {
final int x = (int) event.getX();
/** * x > ableEditWidth (totalWidth - paddingRight - clearDrawableWidth ) * x > ableEditWidth == clearDrawable_X * so , when clearDrawable is visible and onClick it. */
if (this.mClearDrawable.isVisible() && x > this.getWidth() - this.getPaddingRight() - this.mClearDrawable.getIntrinsicWidth()) {
if (event.getAction() == MotionEvent.ACTION_UP) {
this.setError(null);
this.setText("");
}
return true;
}
return this.mOnTouchListener != null && this.mOnTouchListener.onTouch(v, event);
}
/** * Called when the focus state of a view has changed. * * @param v The view whose state has changed. * @param hasFocus The new focus state of v. */
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus) {
this.setClearDrawableVisible(this.getText().length() > 0);
} else {
this.setClearDrawableVisible(false);
}
if (this.mOnFocusChangeListener != null)
this.mOnFocusChangeListener.onFocusChange(v, hasFocus);
}
/** * @param text The text the TextView is displaying * @param start The offset of the start of the range of the text that was * modified * @param lengthBefore The length of the former text that has been replaced * @param lengthAfter The length of the replacement modified text */
@Override
public void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
if (isFocused()) this.setClearDrawableVisible(text.length() > 0);
}
/** * @param s * @param start * @param count * @param after */
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
/** * @param s */
@Override
public void afterTextChanged(Editable s) {
}
}
AIEditText效果图
Github传送门
https://github.com/CaMnter/AIEditText