适配完结篇二 - 谷歌小弟的Android多分辨率适配框架

import android.content.Context;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.ViewGroup.MarginLayoutParams;
import android.widget.TextView;

// 版权声明：    https://blog.csdn.net/lfdfhl/article/details/52735103
public class SupportMultipleScreensUtil {
    public static final int BASE_SCREEN_WIDTH = 1080;
    public static float scale = 1.0F;

    private SupportMultipleScreensUtil() {

    }

    public static void init(Context context) {
        Resources resources = context.getResources();
        DisplayMetrics displayMetrics = resources.getDisplayMetrics();
        int widthPixels = displayMetrics.widthPixels;
        scale = (float) widthPixels / BASE_SCREEN_WIDTH;
    }

    public static void scale(View view) {
        if (null != view) {
            if (view instanceof ViewGroup) {
                scaleViewGroup((ViewGroup) view);
            } else {
                scaleView(view);
            }
        }
    }
    
    public static void scaleViewGroup(ViewGroup viewGroup) {
        for (int i = 0; i < viewGroup.getChildCount(); ++i) {
            View view = viewGroup.getChildAt(i);
            if (view instanceof ViewGroup) {
                scaleViewGroup((ViewGroup) view);
            }
            scaleView(view);
        }
    }

    public static void scaleView(View view) {
        Object isScale = view.getTag(R.id.is_scale_size_tag);
        if (!(isScale instanceof Boolean) || !((Boolean) isScale).booleanValue()) {
            if (view instanceof TextView) {
                scaleTextView((TextView) view);
            } else {
                scaleViewSize(view);
            }
            view.setTag(R.id.is_scale_size_tag, Boolean.valueOf(true));
        }
    }
    
    // 对于TextView，不但要缩放其尺寸，还需要对其字体进行缩放：
        private static void scaleTextView(TextView textView) {
            if (null != textView) {
                scaleViewSize(textView);

                Object isScale = textView.getTag(R.id.is_scale_font_tag);
                if (!(isScale instanceof Boolean) || !((Boolean) isScale).booleanValue()) {
                    float size = textView.getTextSize();
                    size *= scale;
                    textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, size);
                }

                Drawable[] drawables = textView.getCompoundDrawables();
                Drawable leftDrawable = drawables[0];
                Drawable topDrawable = drawables[1];
                Drawable rightDrawable = drawables[2];
                Drawable bottomDrawable = drawables[3];
                setTextViewCompoundDrawables(textView, leftDrawable, topDrawable, rightDrawable, bottomDrawable);
                int compoundDrawablePadding = getScaleValue(textView.getCompoundDrawablePadding());

                textView.setCompoundDrawablePadding(compoundDrawablePadding);
            }
        }

    /**
     * 等比例缩放: 对每个View的宽高，padding，margin值都按比例缩 放，并且在缩放后重新设置其布局参数。 博客地址:
     */
    private static void scaleViewSize(View view) {
        if (null != view) {
            int paddingLeft = getScaleValue(view.getPaddingLeft());
            int paddingTop = getScaleValue(view.getPaddingTop());
            int paddingRight = getScaleValue(view.getPaddingRight());
            int paddingBottom = getScaleValue(view.getPaddingBottom());
            view.setPadding(paddingLeft, paddingTop, paddingRight, paddingBottom);

            LayoutParams layoutParams = view.getLayoutParams();
            if (null != layoutParams) {
                if (layoutParams.width > 0) {
                    layoutParams.width = getScaleValue(layoutParams.width);
                }

                if (layoutParams.height > 0) {
                    layoutParams.height = getScaleValue(layoutParams.height);
                }

                if (layoutParams instanceof MarginLayoutParams) {
                    MarginLayoutParams marginLayoutParams = (MarginLayoutParams) layoutParams;
                    int topMargin = getScaleValue(marginLayoutParams.topMargin);
                    int leftMargin = getScaleValue(marginLayoutParams.leftMargin);
                    int bottomMargin = getScaleValue(marginLayoutParams.bottomMargin);
                    int rightMargin = getScaleValue(marginLayoutParams.rightMargin);
                    marginLayoutParams.topMargin = topMargin;
                    marginLayoutParams.leftMargin = leftMargin;
                    marginLayoutParams.bottomMargin = bottomMargin;
                    marginLayoutParams.rightMargin = rightMargin;
                }
            }
            view.setLayoutParams(layoutParams);
        }
    }

    private static void setTextViewCompoundDrawables(TextView textView, Drawable leftDrawable, Drawable topDrawable,
            Drawable rightDrawable, Drawable bottomDrawable) {
        if (null != leftDrawable) {
            scaleDrawableBounds(leftDrawable);
        }

        if (null != rightDrawable) {
            scaleDrawableBounds(rightDrawable);
        }

        if (null != topDrawable) {
            scaleDrawableBounds(topDrawable);
        }

        if (null != bottomDrawable) {
            scaleDrawableBounds(bottomDrawable);
        }
        textView.setCompoundDrawables(leftDrawable, topDrawable, rightDrawable, bottomDrawable);
    }
    
    // 考虑到对TextView的CompoundDrawable进行缩放
    private static Drawable scaleDrawableBounds(Drawable drawable) {
        int right = getScaleValue(drawable.getIntrinsicWidth());
        int bottom = getScaleValue(drawable.getIntrinsicHeight());
        drawable.setBounds(0, 0, right, bottom);
        return drawable;
    }

    private static int getScaleValue(int value) {
        return value <= 4 ? value : (int) Math.ceil((double) (scale * (float) value));
    }

}    

图简便, 直接贴了代码, R.id.is_scale_size_tag 和 R.id.is_scale_size_tag报错只需要在\res\values下创建ids.xml文件下定义即可

用法

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    View rootView=findViewById(android.R.id.content);
    SupportMultipleScreensUtil.init(getApplication());
    SupportMultipleScreensUtil.scale(rootView);
}

总结

• 切图存放于drawable-nodpi
• 抛开系统的dpi并且摒弃dp和sp，统一使用px作为尺寸单位
• 按照给定高分辨率(如1920*1080)切图和布局, 其实只有1080px有参考价值
• 根据需要, 等比例缩放每个View

目前，xxhdpi分辨率的手机占了主流，所以在该框架中采用了drawable-xxhdpi的切图。倘若以后xxxhdpi分辨率的手机占了主导地位，那么就请UI设计师按照该分辨率切图，我们将其放在drawable-nohdpi中，再修改BASE_SCREEN_WIDTH即可。

文章来源(References)

Android多分辨率适配框架（1）— 核心基础 - CSDN博客