自定义密码输入EditTextLayout

<?xml version="1.0" encoding="utf-8"?><merge xmlns:android="http://schemas.android.com/apk/res/android"              xmlns:app="http://schemas.android.com/apk/res-auto"              android:layout_width="match_parent"              android:layout_height="wrap_content">    <ImageView        android:id="@+id/delete"        android:layout_width="30dp"        android:layout_height="48dp"        android:layout_gravity="center"        android:scaleType="center"        android:src="@drawable/ico_delete"/>    <CheckBox        android:id="@+id/ck_shift"        android:layout_gravity="center"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:background="@drawable/pwd_selector"        android:button="@null"/></merge>

/** * Created by showdy on 2017/3/15. * <p> * 一个用于密码输入的自定义控件 */public class PwdEditLayout extends LinearLayout implements TextWatcher, View.OnFocusChangeListener,        View.OnClickListener, CompoundButton.OnCheckedChangeListener {    private ImageView mDeleteIcon;    private CheckBox mShiftIcon;    private EditText mEditText;    public PwdEditLayout(Context context) {        this(context, null);    }    public PwdEditLayout(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public PwdEditLayout(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        setOrientation(HORIZONTAL);        setCustomBackground();    }    private void setCustomBackground() {        GradientDrawable gd = new GradientDrawable();        gd.setCornerRadius(TypedValue.applyDimension(COMPLEX_UNIT_DIP, 4, Resources.getSystem().getDisplayMetrics()));        gd.setStroke((int) TypedValue.applyDimension(COMPLEX_UNIT_DIP, 1, Resources.getSystem().getDisplayMetrics()), Color.BLUE);        if (Build.VERSION.SDK_INT < 16) {            this.setBackgroundDrawable(gd);        } else {            this.setBackground(gd);        }    }    /**     * Called when a new child is aded to this ViewGroup. Overrides should always     * call super.onViewAdded.     *     * @param child the added child view     */    @Override    public void onViewAdded(View child) {        super.onViewAdded(child);        if (child instanceof EditText) {            if (getChildCount() != 1) {                throw new IllegalArgumentException("Only one EditText can be added in this layout.");            }            mEditText = (EditText) child;            mEditText.setBackgroundColor(Color.TRANSPARENT);            //关键点1            LayoutInflater.from(getContext()).inflate(R.layout.layout_edittext_pwd, this, true);            mDeleteIcon = (ImageView) findViewById(R.id.delete);            mShiftIcon = (CheckBox) findViewById(R.id.ck_shift);            //关键点2            setAddStatesFromChildren(true); //使得父类获得和子控件相同的状态            mEditText.addTextChangedListener(this);            mEditText.setOnFocusChangeListener(this);            mDeleteIcon.setOnClickListener(this);            mShiftIcon.setOnCheckedChangeListener(this);            //设置默认状态---删除按钮和是否显示密码            mShiftIcon.setChecked(false);            updateDeleteIcon(mEditText.getText().toString(), mEditText.isFocused());            updateShowPassword(mShiftIcon.isChecked());        }    }    @Override    public void beforeTextChanged(CharSequence s, int start, int count, int after) {    }    @Override    public void onTextChanged(CharSequence s, int start, int before, int count) {        updateDeleteIcon(s.toString(), mEditText.isFocused());    }    @Override    public void afterTextChanged(Editable s) {    }    @Override    public void onFocusChange(View v, boolean hasFocus) {        updateDeleteIcon(mEditText.getText().toString(), hasFocus);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.delete:                mEditText.setText("");                break;        }    }    @Override    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {        updateShowPassword(isChecked);    }    /**     * 用于是否显示密码     *     * @param password     * @param focused     */    private void updateDeleteIcon(String password, boolean focused) {        if (!TextUtils.isEmpty(password) && focused) {            mDeleteIcon.setVisibility(VISIBLE);        } else {            mDeleteIcon.setVisibility(INVISIBLE);        }    }    /**     * 用于控制是否显示密码     *     * @param checked     */    private void updateShowPassword(boolean checked) {        if (checked) {            mEditText.setTransformationMethod(HideReturnsTransformationMethod.getInstance());        } else {            mEditText.setTransformationMethod(PasswordTransformationMethod.getInstance());        }        mEditText.setSelection(mEditText.getText().toString().length());    }}