Android 弹出软键盘所遇到的坑及解决方法

//1、此layout作为最外层的layout；
//2、设置需要调整的view: setAdjustView(View view);
//3、如果需要控制输入框的显示与隐藏，可以实现OnInputViewVisibleListener接口；
public class SoftInputAdjustLayout extends RelativeLayout {
  private static final String TAG = SoftInputAdjustLayout.class.getSimpleName();
  private View adjustView;
  public SoftInputAdjustLayout(Context context) {
    this(context, null);
  }
  public SoftInputAdjustLayout(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
  }
  public SoftInputAdjustLayout(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    this.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
      @Override
      public void onGlobalLayout() {
        try {
          Rect r = new Rect();
          getWindowVisibleDisplayFrame(r);
          int heightDiff = getRootView().getHeight() - (r.bottom - r.top);
          if (heightDiff > 100) {
            if (onInputViewVisibleListener != null) {
              onInputViewVisibleListener.onShowInputView();
            }
          } else {
            if (onInputViewVisibleListener != null) {
              onInputViewVisibleListener.onHideInputView();
            }
          }
        } catch (Exception e) {
          e.printStackTrace();
        }
      }
    });
  }
  /**
   * 需要调整的view
   *
   * @param adjustView
   */
  public void setAdjustView(View adjustView) {
    this.adjustView = adjustView;
  }
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    if (adjustView != null) {
      Rect rect = new Rect();
      getWindowVisibleDisplayFrame(rect);
      int totalHeight = getHeight();
      int nowHeight = rect.bottom - rect.top;
      int keyBoardHeight = totalHeight - nowHeight;
      if (keyBoardHeight > totalHeight / 4) {
        super.onMeasure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(totalHeight, MeasureSpec.EXACTLY));
        LayoutParams params = (LayoutParams) adjustView.getLayoutParams();
        params.bottomMargin = keyBoardHeight;
      } else {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        LayoutParams params = (LayoutParams) adjustView.getLayoutParams();
        params.bottomMargin = 0;
      }
    } else {
      super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
  }
  private OnInputViewVisibleListener onInputViewVisibleListener;
  public void setOnInputViewVisibleListener(OnInputViewVisibleListener listener) {
    onInputViewVisibleListener = listener;
  }
  public interface OnInputViewVisibleListener {
    void onShowInputView();
    void onHideInputView();
  }
}

 <!--此view用于获取焦点，当软件盘弹出时，根据此view来弹出，而此view在最顶部，且大小为0，所以软件盘弹出，不会把背景顶上去-->
  <View
    android:layout_width="0px"
    android:layout_height="0px"
    android:focusable="true" 
android:focusableInTouchMode="true" />