getCompoundDrawables
方法简介:
用于获取当下该控件的上下左右位置的Drawable引用,该方法返回的是Drawable[]数组,length为4,分别对应Left,Top,Right和Bottom的Drawable引用。比如:以下代码的Edittext,drawable[2]就对应于EditText控件的右端。在代码中动态添加图标就用到这个方法,相当于XML文件中的drawableRight。
代码:
- public class ClearableEditText extends EditText implements View.OnTouchListener,View.OnFocusChangeListener,TextWatcher {
-
- public interface Listener {
- void didClearText();
- }
-
- public void setListener(Listener listener) {
- this.listener = listener;
- }
-
- private Drawable xD;
- private Listener listener;
-
- public ClearableEditText(Context context) {
- super(context);
- init();
- }
-
- public ClearableEditText(Context context,AttributeSet attrs) {
- super(context,attrs);
- init();
- }
-
- public ClearableEditText(Context context,AttributeSet attrs,int defStyle) {
- super(context,attrs,defStyle);
- init();
- }
-
- @Override
- public void setOnTouchListener(OnTouchListener l) {
- this.l = l;
- }
-
- @Override
- public void setOnFocusChangeListener(OnFocusChangeListener f) {
- this.f = f;
- }
-
- private OnTouchListener l;
- private OnFocusChangeListener f;
-
- @Override
- public boolean onTouch(View v,MotionEvent event) {
- if (getCompoundDrawables()[2] != null) {
- boolean tappedX = event.getX() > (getWidth() - getPaddingRight() - xD
- .getIntrinsicWidth());
- if (tappedX) {
- if (event.getAction() == MotionEvent.ACTION_UP) {
- setText("");
- if (listener != null) {
- listener.didClearText();
- }
- }
- return true;
- }
- }
- if (l != null) {
- return l.onTouch(v,event);
- }
- return false;
- }
-
- @Override
- public void onFocusChange(View v,boolean hasFocus) {
- if (hasFocus) {
- setClearIconVisible(getText().length() > 0);
- } else {
- setClearIconVisible(false);
- }
- if (f != null) {
- f.onFocusChange(v,hasFocus);
- }
- }
-
- @Override
- public void onTextChanged(CharSequence s,int start,int before,int count) {
- if (isFocused()) {
- setClearIconVisible(getText().length() > 0);
- }
- }
-
- @Override
- public void beforeTextChanged(CharSequence s,int count,int after) {
-
- }
-
- @Override
- public void afterTextChanged(Editable s) {
-
- }
-
- private void init() {
- xD = getCompoundDrawables()[2];
- if (xD == null) {
- xD = getResources()
- .getDrawable(android.R.drawable.presence_offline);
- }
- xD.setBounds(0,0,xD.getIntrinsicWidth(),xD.getIntrinsicHeight());
- setClearIconVisible(false);
- super.setOnTouchListener(this);
- super.setOnFocusChangeListener(this);
- addTextChangedListener(this);
- }
-
- protected void setClearIconVisible(boolean visible) {
- boolean wasVisible = (getCompoundDrawables()[2] != null);
- if (visible != wasVisible) {
- Drawable x = visible ? xD : null;
- setCompoundDrawables(getCompoundDrawables()[0],getCompoundDrawables()[1],x,getCompoundDrawables()[3]);
- }
- }
-
- }
拓展:
- loginPswEt.setTransformationMethod(HideReturnsTransformationMethod.getInstance());//隐藏密码
- loginPswEt.setTransformationMethod(PasswordTransformationMethod.getInstance());//显示密码
此至!