Android自定义密码输入EditTextLayout

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/**
 * Created by showdy on 2017/3/15.
 * 

 * 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());
  }

}