针对 API 14-17、17-30、30+

问题描述

编辑 09.05.2021：

一般来说，我想通过调整 LayoutParams 中的一些几何值，根据智能手机的显示尺寸以编程方式调整某些按钮的 onCreate()。显然没那么简单。

终于找到了一种方法，它可能在 API 14-17、17-30、30+ 之间工作。

我的目标是为 14-30+ 之间的所有 API 确定没有插图/导航栏元素的“真实屏幕尺寸”。

我仍然需要调整

---

屏幕尺寸查询（宽度、高度）：

 //++++++++++++++ disPLAY SIZES +++++++++++++

displayMetrics realdisplayMetrics = new displayMetrics();

int realdisplayWidth;
int realdisplayHeight;

//++++++++++++++ GET HORIZONTAL SCREENSIZE +++++++++

public int getRealScreenWidth(){

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
        // targeting BUILDVERSIONS GREATER EQUAL API:30

        WindowMetrics windowMetrics = getwindowManager().getCurrentwindowMetrics();
        // HORIZONTAL disPLAY SIZE INCLUDING INSETS

        WindowInsets windowInsets = windowMetrics.getwindowInsets();
        Insets insets = windowInsets.getInsetsIgnoringVisibility(WindowInsets.Type.navigationBars()
                | WindowInsets.Type.displayCutout());

        int insetsWidth = insets.right + insets.left;
        // GET THE SIZE OF HORIZONTAL INSETS

        Rect bounds = windowMetrics.getBounds();
        realdisplayWidth = bounds.width() - insetsWidth;
        // HORIZONTAL SCREEN SIZE WITHOUT INSETS

        return realdisplayWidth;

    }

    else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
        // targeting BUILDVERSIONS ABOVE API:17,UNTIL API:30

        display display = this.getwindowManager().getDefaultdisplay();

        display.getRealMetrics(realdisplayMetrics);
        realdisplayWidth = realdisplayMetrics.widthPixels;

        return realdisplayWidth;
    }

    else if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
        //REFLECTION FOR BUILDVERSIONs ABOVE API:14 UNTIL API:17

        display display = this.getwindowManager().getDefaultdisplay();

        try {
            Method getHorizontalSize = display.class.getmethod("getWidth");
            realdisplayWidth = (Integer) getHorizontalSize.invoke(display);
        } catch (Exception e) {
            realdisplayWidth = 1000;
        }
        return realdisplayWidth;
    }
    else {
    return realdisplayWidth = 1000;
    }
}

//++++++++++++++ GET VERTICAL SCREENSIZE +++++++++

public int getRealScreenHeight(){

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
        // targeting BUILDVERSIONS GREATER EQUAL API:30

        WindowMetrics windowMetrics = getwindowManager().getCurrentwindowMetrics();
        // VERTICAL disPLAY SIZE INCLUDING INSETS

        WindowInsets windowInsets = windowMetrics.getwindowInsets();
        Insets insets = windowInsets.getInsetsIgnoringVisibility(WindowInsets.Type.navigationBars()
                | WindowInsets.Type.displayCutout());

        int insetsHeight = insets.top + insets.bottom;
        // GET THE SIZE OF VERTICAL INSETS

        Rect bounds = windowMetrics.getBounds();
        realdisplayHeight = bounds.height() - insetsHeight;
        // HORIZONTAL SCREEN SIZE WITHOUT INSETS

        return realdisplayHeight;

    }

    else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
        // targeting BUILDVERSIONS ABOVE API:17,UNTIL API:30

        display display = this.getwindowManager().getDefaultdisplay();

        display.getRealMetrics(realdisplayMetrics);
        realdisplayHeight = realdisplayMetrics.heightPixels;

        return realdisplayHeight;
    }

    else if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
        //REFLECTION FOR BUILDVERSIONs ABOVE API:14 UNTIL API:17

        display display = this.getwindowManager().getDefaultdisplay();

        try {
            Method getVerticalSize = display.class.getmethod("getHeight");
            realdisplayHeight = (Integer) getVerticalSize.invoke(display);
        } catch (Exception e) {
            realdisplayHeight = 1500;
        }
        return realdisplayHeight;
    }
    else {
        return realdisplayHeight = 1500;
    }
}

public void getLog(){
    Log.i("screenWide:",String.valueOf(getRealScreenWidth()));
    Log.i("screenHeight:",String.valueOf(getRealScreenHeight()));
}

---

更改布局参数：

//++++++++++++++ EXAMPLE METHOD FOR CHANGING ParaMS IN ONCREATE() ++++++++++

public void changingLayoutParams(){

    // EXAMPLE FOR CHANGING HORIZONTAL LAYOUT ParaMS FOR API ABOVE 17:

    Button number1 = (Button) findViewById(R.id.number1);
    Button sidebar_v_1 = (Button) findViewById(R.id.sidebar_v_1);

    if (getRealScreenWidth() >= 1000){

        ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) number1.getLayoutParams();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            params.setMarginStart((int) getResources().getDimension(R.dimen.levelSymbolLeftMargin));
            params.setMargins(params.getMarginStart(),params.topMargin,params.getMarginEnd(),params.bottomMargin);
        }

        ViewGroup.MarginLayoutParams params2 = (ViewGroup.MarginLayoutParams) sidebar_v_1.getLayoutParams();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            params2.setMarginStart((int) getResources().getDimension(R.dimen.levelSymbolLeftMargin));
            params2.setMargins(params2.getMarginStart(),params2.topMargin,params2.getMarginEnd(),params2.bottomMargin);
        }
    }
    else if (getRealScreenWidth() < 1000){

        ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) number1.getLayoutParams();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            params.setMarginStart((int) getResources().getDimension(R.dimen.lockerMarginLeft));
            params.setMargins(params.getMarginStart(),params.bottomMargin);
        }

        ViewGroup.MarginLayoutParams params2 = (ViewGroup.MarginLayoutParams) sidebar_v_1.getLayoutParams();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            params2.setMarginStart((int) getResources().getDimension(R.dimen.lockerMarginLeft));
            params2.setMargins(params2.getMarginStart(),params2.bottomMargin);
        }
    }

}

---

我构建了一个 ConstraintLayout，里面有几个嵌套的布局，具有以下粗略的结构（减少了内部元素的数量）：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    android:id="@+id/outerBlock"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.core.widget.nestedScrollView
        android:id="@+id/scroll"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginRight="@dimen/nestedScroll_mR"
        android:layout_marginEnd="@dimen/nestedScroll_mR"
        android:layout_marginLeft="@dimen/nestedScroll_mL"
        android:layout_marginStart="@dimen/nestedScroll_mL"
        android:layout_marginTop="@dimen/nestedScroll_mT"
        android:layout_marginBottom="@dimen/nestedScroll_mB"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:fillViewport="true">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/wrapper"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <androidx.constraintlayout.widget.ConstraintLayout
                android:id="@+id/innerBlock0"
                android:layout_width="match_parent"
                android:layout_height="@dimen/firstInnerBlockH"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintRight_toRightOf="parent">

            </androidx.constraintlayout.widget.ConstraintLayout>


            <androidx.constraintlayout.widget.ConstraintLayout
                android:id="@+id/innerBlock1"
                android:layout_width="match_parent"
                android:layout_height="@dimen/innerBlockH"
                app:layout_constraintTop_toBottomOf="@id/innerBlock0"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintRight_toRightOf="parent">

                <Button
                    android:id="@+id/number1"
                    android:layout_width="@dimen/levelSymbol"
                    android:layout_height="@dimen/levelSymbol"
                    android:background="@drawable/number1"
                    android:layout_marginTop="@dimen/numberMarginTop"
                    android:layout_marginLeft="@dimen/numberMarginLeft"
                    android:layout_marginStart="@dimen/numberMarginLeft"
                    app:layout_constraintTop_toTopOf="parent"
                    app:layout_constraintLeft_toLeftOf="parent" />

                <Button
                    android:id="@+id/sidebar_v_1"
                    android:layout_width="@dimen/sidebarVWidth"
                    android:layout_height="@dimen/sidebarVHeight"
                    android:background="@drawable/side_v"
                    android:layout_marginLeft="@dimen/sideMarginLeft"
                    android:layout_marginStart="@dimen/sideMarginLeft"
                    app:layout_constraintTop_toBottomOf="@id/number1"
                    app:layout_constraintLeft_toLeftOf="parent" />

            </androidx.constraintlayout.widget.ConstraintLayout>

            <androidx.constraintlayout.widget.ConstraintLayout
                android:id="@+id/innerBlock2"
                android:layout_width="match_parent"
                android:layout_height="@dimen/innerBlockH"
                app:layout_constraintTop_toBottomOf="@id/innerBlock1">

            </androidx.constraintlayout.widget.ConstraintLayout>

        </androidx.constraintlayout.widget.ConstraintLayout>

    </androidx.core.widget.nestedScrollView>

</androidx.constraintlayout.widget.ConstraintLayout>

---

通过更改 marginLeft 和 marginStart LayoutParam，布局将更适合显示。一开始我只是为 1 个屏幕尺寸设计它。

解决方法

我注意到您正在尝试更改 onCreate() 中 2 个按钮的边距值。这与更改 activity_main.xml 文件中的边距值具有相同的效果。

如果您想做其他事情，例如，在单击按钮时更改这些值，您只需将 onClickListener 设置为另一个按钮，然后将此代码放入该 onClick 侦听器中。希望这可以帮助。谢谢。