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我无法将 ImageView 向左移动。我每次按一个按钮都必须这样做，通常我只能按8次。问题是，在第 4 步，图像会变小，无论工作平板电脑的分辨率如何。图像大小设置为 TextView 中的数字大小。在 10 英寸的平板电脑中，它有 51 个像素，而在 7 英寸的平板电脑中，它有 36 个像素。这个尺寸会一直保留，直到我第四次按下按钮，两个设备上的尺寸都变为 26。我真的被卡住了，不知道为什么会这样。也许你可以帮帮我。

这是xml：

    <EditText
        android:id="@+id/secondNumber"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:background="#00000000"
        android:ellipsize="end"
        android:gravity="right"
        android:hint="@string/second_number_hint"
        android:inputType="number"
        android:maxLength="8"
        android:textSize="@dimen/number" />

    <EditText
        android:id="@+id/firstNumber"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@id/secondNumber"
        android:layout_centerInParent="true"
        android:background="#00000000"
        android:ellipsize="end"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:gravity="right"
        android:hint="@string/first_number_hint"
        android:imeOptions="actionSend"
        android:inputType="number"
        android:maxLength="8"
        android:textAlignment="textEnd"
        android:textSize="@dimen/number" />

    <View
        android:id="@+id/separator"
        android:layout_width="0px"
        android:layout_height="0.3dp"
        android:layout_alignLeft="@+id/secondNumber"
        android:layout_alignRight="@+id/secondNumber"
        android:layout_below="@+id/secondNumber"
        android:background="#000000" />

    <Button
        android:id="@+id/nextStep"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:text="@string/next"
        android:visibility="invisible" />

    <Button
        android:id="@+id/previousStep"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_toRightOf="@+id/nextStep"
        android:text="@string/previous"
        android:visibility="invisible" />

    <TextView
        android:id="@+id/additionSign"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/firstNumber"
        android:layout_alignBottom="@+id/firstNumber"
        android:layout_toRightOf="@+id/firstNumber"
        android:text="@string/addition_sign"
        android:textSize="@dimen/number" />

    <Button
        android:id="@+id/newAddition"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_toRightOf="@+id/previousStep"
        android:text="@string/new_addition"
        android:visibility="invisible" />

    <ImageView
        android:id="@+id/secondAdditionArrow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/firstAdditionArrow"
        android:layout_centerVertical="true"
        android:contentDescription="@string/content_description_show_first_number"
        android:src="@drawable/blue_arrow"
        android:visibility="invisible" />

    <TextView
        android:id="@+id/additionMessage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/secondAdditionArrow"
        android:layout_toRightOf="@+id/firstAdditionArrow"
        android:text="@string/addition_message"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textColor="@color/blue_arrow_text_color"
        android:textSize="@dimen/arrow_message_size"
        android:textStyle="bold"
        android:visibility="invisible" />

    <ImageView
        android:id="@+id/firstAdditionArrow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/additionSign"
        android:layout_alignTop="@+id/additionSign"
        android:layout_toRightOf="@+id/additionSign"
        android:contentDescription="@string/content_description_show_first_number"
        android:src="@drawable/blue_arrow"
        android:visibility="invisible" />

    <TextView
        android:id="@+id/finishedMessage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_below="@+id/result"
        android:layout_centerHorizontal="true"
        android:gravity="center|top"
        android:lines="5"
        android:maxEms="15"
        android:text="@string/addition_finish_message"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textColor="@color/red_arrow_color_text"
        android:textSize="@dimen/arrow_message_size"
        android:textStyle="bold"
        android:visibility="invisible" />

    <TextView
        android:id="@+id/carryDigit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/firstNumber"
        android:layout_alignRight="@+id/firstNumber"
        android:text="@string/carry_digit"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textColor="@color/green_arrow_text_color"
        android:textSize="@dimen/number"
        android:textStyle="bold"
        android:visibility="invisible" />

    <EditText
        android:id="@+id/result"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@id/separator"
        android:layout_below="@+id/separator"
        android:background="#00000000"
        android:ellipsize="end"
        android:enabled="false"
        android:gravity="right"
        android:hint="@string/result"
        android:inputType="number"
        android:maxLength="10"
        android:textSize="@dimen/number" >

        <requestFocus />
    </EditText>

    <ImageView
        android:id="@+id/digitKeepArrow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/result"
        android:layout_below="@+id/result"
        android:contentDescription="@string/show_addition_result"
        android:src="@drawable/red_arrow"
        android:visibility="invisible" />

    <TextView
        android:id="@+id/keedTheDigitMessage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/digitKeepArrow"
        android:layout_below="@+id/digitKeepArrow"
        android:gravity="fill|center"
        android:maxLines="1"
        android:minEms="10"
        android:text="@string/addition_message"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textColor="@color/red_arrow_color_text"
        android:textSize="@dimen/arrow_message_size"
        android:textStyle="bold"
        android:visibility="invisible" />

    <TextView
        android:id="@+id/carryDigitMessage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/carryDigitArrow"
        android:layout_alignLeft="@+id/carryDigitArrow"
        android:minEms="10"
        android:text="@string/carry_digit"
        android:textColor="@color/green_arrow_text_color"
        android:textSize="@dimen/arrow_message_size"
        android:textStyle="bold"
        android:visibility="invisible" />

    <ImageView
        android:id="@+id/carryDigitArrow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/carryDigit"
        android:layout_alignRight="@+id/firstNumber"
        android:contentDescription="@string/show_carry_digit"
        android:src="@drawable/green_arrow"
        android:visibility="invisible" />

</RelativeLayout>

移动 ImageView 的函数是这样的：

  Rect bounds = new Rect();
        Paint textPaint = firstNumber.getPaint();
        textPaint.getTextBounds(firstNumber.getText().toString(), 0,
                firstNumber.getText().toString().length(), bounds);
        int width = bounds.width();


            RelativeLayout.LayoutParams position = new RelativeLayout.LayoutParams(
                    arrow.getWidth(), arrow.getHeight());

            position.setMargins(
                    arrow.getLeft() - width / this.firstNumber.size(),
                    arrow.getTop(), arrow.getLeft(), arrow.getBottom());



            arrow.setLayoutParams(position);


        }

尺寸 xml：

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="number">55dp</dimen>
    <dimen name="arrow_message_size">32dp</dimen>
</resources>

不能直接发图，不好意思。

和 strings.xml 文件：

<resources>

    <string name="app_name">Math Tutor</string>
    <string name="title_main_activity">Math Tutor</string>
    <string name="welcome_message">Welcome to Math Tutor! Choose an operation from the left side pane to get started.</string>
    <string name="menu_title">Basic Math</string>
    <string name="addition_sign">+</string>
    <string name="solve">Solve</string>
    <string name="next">Next</string>
    <string name="previous">Previous</string>
    <string name="insert_first_number">Insert first number</string>
    <string name="first_step">First step</string>
    <string name="second_step">Second step</string>
    <string name="third_step">Third step</string>
    <string name="first_number_hint">Number 1</string>
    <string name="second_number_hint">Number 2</string>
    <string name="result">Result</string>
    <string name="new_addition">New Addition</string>
    <string name="subtraction_sign">-</string>
    <string name="number">Number</string>
    <string name="exponent">Exponent</string>
    <string name="equal_sign">=</string>
    <string name="power">Power</string>
    <string name="base">Base</string>
    <string name="content_description_show_first_number">Show first number</string>
    <string name="addition_message">Addition</string>
    <string name="show_addition_result">Show addition result</string>
    <string name="addition_finish_message">The operation is finished. Press New Addition for a new addition!</string>
    <string name="carry_digit">1</string>
    <string name="show_carry_digit">Show carry digit</string>

</resources>

奇怪的是，我已经用这种方法成功地移动了我想要的箭头，但是这个似乎并不想做我想做的事。

更新

我已经设法在第 4 步时修复了调整大小，但现在当我到达第 8 步时，我总是会拉伸图像。这是更新的代码：

Rect bounds = new Rect();
        Paint textPaint = result.getPaint();
        textPaint.getTextBounds(result.getText().toString(), 0, result
                .getText().toString().length(), bounds);
        int width = bounds.width();

        RelativeLayout.LayoutParams position = new RelativeLayout.LayoutParams(
                this.carryDigitArrowOriginalPosition.width,
                this.carryDigitArrowOriginalPosition.height);
        position.setMargins(this.carryDigitArrowOriginalPosition.leftMargin
                - width, this.carryDigitArrowOriginalPosition.topMargin,
                result.getRight(),
                this.carryDigitArrowOriginalPosition.bottomMargin);

其余的都是一样的。我不明白为什么它会拉伸图像，即使它的宽度很大。以下是发生的 2 个屏幕：

不工作 工作

4

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