Android 以编程方式更改导航抽屉的边距

我有一个导航抽屉，但我想设置一些边距，就像在XML文件中设置

android:layout\u marginTop=“72dp”

，但我想以编程方式设置边距

My activity_main.xml：

<FrameLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:fitsSystemWindows="false"
    android:background="@drawable/back_blue_translucent"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <android.support.v4.widget.DrawerLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/drawer_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="false"
        tools:context="com.bentleycarr.mentalmaths.MainActivity">

        <FrameLayout
            android:id="@+id/container"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="#f9f9f9"/>

        <fragment android:id="@+id/navigation_drawer"
            android:layout_width="@dimen/navigation_drawer_width"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            android:layout_marginTop="72dp" <!--I want to change this -->
            android:name="com.bentleycarr.mentalmaths.NavigationDrawerFragment" />

    </android.support.v4.widget.DrawerLayout>
</FrameLayout>

尝试：

---

我的任务是从屏幕边框（左侧/右侧）设置精确大小的边距，因此我在抽屉布局中覆盖了默认的

generateLayoutParams（attrs）

，以调整其视口的大小：

public class CustomMarginDrawerLayout extends DrawerLayout {
    private static final int DRAWER_MARGIN_IN_DP = 48;
    private final Context context;

    public CustomMarginDrawerLayout(Context context) {
        super(context);
        this.context = context;
    }

    public CustomMarginDrawerLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
    }

    public CustomMarginDrawerLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        this.context = context;
    }

    @Override
    public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
        ViewGroup.LayoutParams params = super.generateLayoutParams(attrs);
        int margin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, DRAWER_MARGIN_IN_DP, getResources().getDisplayMetrics());
        params.width = getScreenWidth(context) - margin;
        return params;
    }

    private int getScreenWidth(Context context) {
        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics metrics = new DisplayMetrics();
        windowManager.getDefaultDisplay().getMetrics(metrics);
        return metrics.widthPixels;
    }
}

---

它只是崩溃了-（我将编辑原始帖子，因为我无法在评论中发布logcat。请将FrameLayout更改为DrumerLayout并添加其ID。）。

FrameLayout root = (FrameLayout) findViewById(R.id.yourID);
FrameLayout.LayoutParams params = (FrameLayout.LayoutParams)root.getLayoutParams();
   params.setMargins(left, top, right, bottom); 
   root.setLayoutParams(params);

public class CustomMarginDrawerLayout extends DrawerLayout {
    private static final int DRAWER_MARGIN_IN_DP = 48;
    private final Context context;

    public CustomMarginDrawerLayout(Context context) {
        super(context);
        this.context = context;
    }

    public CustomMarginDrawerLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context = context;
    }

    public CustomMarginDrawerLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        this.context = context;
    }

    @Override
    public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
        ViewGroup.LayoutParams params = super.generateLayoutParams(attrs);
        int margin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, DRAWER_MARGIN_IN_DP, getResources().getDisplayMetrics());
        params.width = getScreenWidth(context) - margin;
        return params;
    }

    private int getScreenWidth(Context context) {
        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics metrics = new DisplayMetrics();
        windowManager.getDefaultDisplay().getMetrics(metrics);
        return metrics.widthPixels;
    }
}