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
<?xml version="1.0" encoding="UTF-8"?>
<resources>
<item type="id" name="test"/>
</resources>
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。
