AutoLayout 代码解读

本文最后更新于:5 年前

AutoLayout 代码解读


Reference


AutoLayoutConifg

该类的作用是获取屏幕宽高、AndroidManifest.xml中的design_widthdesign_width字段的值。

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public class AutoLayoutConifg {
private static AutoLayoutConifg sIntance = new AutoLayoutConifg();

private static final String KEY_DESIGN_WIDTH = "design_width";
private static final String KEY_DESIGN_HEIGHT = "design_height";

private int mScreenWidth;
private int mScreenHeight;

private int mDesignWidth;
private int mDesignHeight;

private boolean useDeviceSize;

private AutoLayoutConifg() {
}

public static AutoLayoutConifg getInstance() {
return sIntance;
}

public void init(Context context) {
getMetaData(context);

int[] screenSize = ScreenUtils.getScreenSize(context, useDeviceSize);
mScreenWidth = screenSize[0];
mScreenHeight = screenSize[1];
L.e("screenWidth = " + mScreenWidth + ", screenHeight = " + mScreenHeight);
}

private void getMetaData(Context context) {
PackageManager packageManager = context.getPackageManager();
ApplicationInfo applicationInfo;
try {
applicationInfo = packageManager.getApplicationInfo(context.getPackageName(), PackageManager.GET_META_DATA);
if (applicationInfo != null && applicationInfo.metaData != null) {
mDesignWidth = (int) applicationInfo.metaData.get(KEY_DESIGN_WIDTH);
mDesignHeight = (int) applicationInfo.metaData.get(KEY_DESIGN_HEIGHT);
}
} catch (PackageManager.NameNotFoundException e) {
throw new RuntimeException("you must set " + KEY_DESIGN_WIDTH + " and " + KEY_DESIGN_HEIGHT + " in your manifest file.", e);
}
L.e("designWidth = " + mDesignWidth + ", designHeight = " + mDesignHeight);
}

public void checkParams() {
if (mDesignHeight <= 0 || mDesignWidth <= 0) {
throw new RuntimeException("you must set " + KEY_DESIGN_WIDTH + " and " + KEY_DESIGN_HEIGHT + " in your manifest file.");
}
}

public AutoLayoutConifg useDeviceSize() {
useDeviceSize = true;
return this;
}

public int getScreenWidth() {
return mScreenWidth;
}

public int getScreenHeight() {
return mScreenHeight;
}

public int getDesignWidth() {
return mDesignWidth;
}

public int getDesignHeight() {
return mDesignHeight;
}
}

init(Context context)

获取屏幕宽高。

getMetaData(Context context)

获取AndroidManifest.xml中位于application节点下的design_widthdesign_width字段的值。


AutoLayoutHelper

该类的作用是计算属性的值并保存到AutoLayoutInfo对象中,在需要的时候将AutoLayoutInfo对象中值替换给对应的属性。

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public class AutoLayoutHelper {
private static final String TAG = "AutoLayoutHelper";

private final ViewGroup mHost;

private static final int[] LL = new int[]{
android.R.attr.textSize,
android.R.attr.padding,
android.R.attr.paddingLeft,
android.R.attr.paddingTop,
android.R.attr.paddingRight,
android.R.attr.paddingBottom,
android.R.attr.layout_width,
android.R.attr.layout_height,
android.R.attr.layout_margin,
android.R.attr.layout_marginLeft,
android.R.attr.layout_marginTop,
android.R.attr.layout_marginRight,
android.R.attr.layout_marginBottom,
android.R.attr.maxWidth,
android.R.attr.maxHeight,
android.R.attr.minWidth,
android.R.attr.minHeight,
android.R.attr.layout_marginStart,
android.R.attr.layout_marginEnd,
android.R.attr.paddingStart,
android.R.attr.paddingEnd,
};

private static final int INDEX_TEXT_SIZE = 0;
private static final int INDEX_PADDING = 1;
private static final int INDEX_PADDING_LEFT = 2;
private static final int INDEX_PADDING_TOP = 3;
private static final int INDEX_PADDING_RIGHT = 4;
private static final int INDEX_PADDING_BOTTOM = 5;
private static final int INDEX_WIDTH = 6;
private static final int INDEX_HEIGHT = 7;
private static final int INDEX_MARGIN = 8;
private static final int INDEX_MARGIN_LEFT = 9;
private static final int INDEX_MARGIN_TOP = 10;
private static final int INDEX_MARGIN_RIGHT = 11;
private static final int INDEX_MARGIN_BOTTOM = 12;
private static final int INDEX_MAX_WIDTH = 13;
private static final int INDEX_MAX_HEIGHT = 14;
private static final int INDEX_MIN_WIDTH = 15;
private static final int INDEX_MIN_HEIGHT = 16;
private static final int INDEX_MARGIN_START = 17;
private static final int INDEX_MARGIN_END = 18;
private static final int INDEX_PADDING_START = 19;
private static final int INDEX_PADDING_END = 20;

public AutoLayoutHelper(ViewGroup host) {
mHost = host;

initAutoLayoutConfig(host);
}

private void initAutoLayoutConfig(ViewGroup host) {
if (host != null) {
AutoLayoutConifg autoLayoutConifg = AutoLayoutConifg.getInstance();
autoLayoutConifg.init(host.getContext());
} else {
Log.e(TAG, "host == null");
}
}

public void adjustChildren() {
AutoLayoutConifg.getInstance().checkParams();
for (int i = 0, n = mHost.getChildCount(); i < n; i++) {
View view = mHost.getChildAt(i);
ViewGroup.LayoutParams params = view.getLayoutParams();
if (params instanceof AutoLayoutParams) {
AutoLayoutInfo info = ((AutoLayoutParams) params).getAutoLayoutInfo();
if (info != null) {
info.fillAttrs(view);
}
}
}
}

public static AutoLayoutInfo getAutoLayoutInfo(Context context, AttributeSet attrs) {
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AutoLayout_Layout);
int baseWidth = a.getInt(R.styleable.AutoLayout_Layout_layout_auto_basewidth, 0);
int baseHeight = a.getInt(R.styleable.AutoLayout_Layout_layout_auto_baseheight, 0);
a.recycle();

AutoLayoutInfo info = new AutoLayoutInfo();
TypedArray array = context.obtainStyledAttributes(attrs, LL);
for (int i = 0, n = array.getIndexCount(); i < n; i++) {
int index = array.getIndex(i);

if (!DimenUtils.isPxVal(array.peekValue(index))) {
continue;
}

int pxVal;
try {
pxVal = array.getDimensionPixelOffset(index, 0);
} catch (Exception e) {
e.printStackTrace();
continue;
}
switch (index) {
case INDEX_TEXT_SIZE:
info.addAttr(new TextSizeAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_PADDING:
info.addAttr(new PaddingAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_PADDING_LEFT:
case INDEX_PADDING_START:
info.addAttr(new PaddingLeftAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_PADDING_TOP:
info.addAttr(new PaddingTopAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_PADDING_RIGHT:
case INDEX_PADDING_END:
info.addAttr(new PaddingRightAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_PADDING_BOTTOM:
info.addAttr(new PaddingBottomAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_WIDTH:
info.addAttr(new WidthAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_HEIGHT:
info.addAttr(new HeightAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_MARGIN:
info.addAttr(new MarginAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_MARGIN_LEFT:
case INDEX_MARGIN_START:
info.addAttr(new MarginLeftAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_MARGIN_TOP:
info.addAttr(new MarginTopAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_MARGIN_RIGHT:
case INDEX_MARGIN_END:
info.addAttr(new MarginRightAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_MARGIN_BOTTOM:
info.addAttr(new MarginBottomAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_MAX_WIDTH:
info.addAttr(new MaxWidthAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_MAX_HEIGHT:
info.addAttr(new MaxHeightAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_MIN_WIDTH:
info.addAttr(new MinWidthAttr(pxVal, baseWidth, baseHeight));
break;
case INDEX_MIN_HEIGHT:
info.addAttr(new MinHeightAttr(pxVal, baseWidth, baseHeight));
break;
}
}
array.recycle();
L.e("getAutoLayoutInfo " + info.toString());
return info;
}

public interface AutoLayoutParams {
AutoLayoutInfo getAutoLayoutInfo();
}
}

adjustChildren()

遍历子 View,如果其布局参数是AutoLayoutParams,则将计算后的属性的值替换给对应的属性。

getAutoLayoutInfo(Context context, AttributeSet attrs)

遍历属性,重新计算属性的值后保存到AutoLayoutInfo对象中。


AutoLayoutInfo

该类的作用是替换属性的值为计算后的值。

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public class AutoLayoutInfo {
private List<AutoAttr> autoAttrs = new ArrayList<>();

public void fillAttrs(View view) {
for (AutoAttr autoAttr : autoAttrs) {
autoAttr.apply(view);
}
}

public static AutoLayoutInfo getAttrFromView(View view, int attrs, int base) {
ViewGroup.LayoutParams params = view.getLayoutParams();
if (params == null) {
return null;
}

AutoLayoutInfo autoLayoutInfo = new AutoLayoutInfo();

// width, height
if ((attrs & Attrs.WIDTH) != 0 && params.width > 0) {
autoLayoutInfo.addAttr(WidthAttr.generate(params.width, base));
}

if ((attrs & Attrs.HEIGHT) != 0 && params.height > 0) {
autoLayoutInfo.addAttr(HeightAttr.generate(params.height, base));
}

// margin
if (params instanceof ViewGroup.MarginLayoutParams) {
if ((attrs & Attrs.MARGIN) != 0) {
autoLayoutInfo.addAttr(MarginLeftAttr.generate(((ViewGroup.MarginLayoutParams) params).leftMargin, base));
autoLayoutInfo.addAttr(MarginTopAttr.generate(((ViewGroup.MarginLayoutParams) params).topMargin, base));
autoLayoutInfo.addAttr(MarginRightAttr.generate(((ViewGroup.MarginLayoutParams) params).rightMargin, base));
autoLayoutInfo.addAttr(MarginBottomAttr.generate(((ViewGroup.MarginLayoutParams) params).bottomMargin, base));
}
if ((attrs & Attrs.MARGIN_LEFT) != 0) {
autoLayoutInfo.addAttr(MarginLeftAttr.generate(((ViewGroup.MarginLayoutParams) params).leftMargin, base));
}
if ((attrs & Attrs.MARGIN_TOP) != 0) {
autoLayoutInfo.addAttr(MarginTopAttr.generate(((ViewGroup.MarginLayoutParams) params).topMargin, base));
}
if ((attrs & Attrs.MARGIN_RIGHT) != 0) {
autoLayoutInfo.addAttr(MarginRightAttr.generate(((ViewGroup.MarginLayoutParams) params).rightMargin, base));
}
if ((attrs & Attrs.MARGIN_BOTTOM) != 0) {
autoLayoutInfo.addAttr(MarginBottomAttr.generate(((ViewGroup.MarginLayoutParams) params).bottomMargin, base));
}
}

// padding
if ((attrs & Attrs.PADDING) != 0) {
autoLayoutInfo.addAttr(PaddingLeftAttr.generate(view.getPaddingLeft(), base));
autoLayoutInfo.addAttr(PaddingTopAttr.generate(view.getPaddingTop(), base));
autoLayoutInfo.addAttr(PaddingRightAttr.generate(view.getPaddingRight(), base));
autoLayoutInfo.addAttr(PaddingBottomAttr.generate(view.getPaddingBottom(), base));
}
if ((attrs & Attrs.PADDING_LEFT) != 0) {
autoLayoutInfo.addAttr(MarginLeftAttr.generate(view.getPaddingLeft(), base));
}
if ((attrs & Attrs.PADDING_TOP) != 0) {
autoLayoutInfo.addAttr(MarginTopAttr.generate(view.getPaddingTop(), base));
}
if ((attrs & Attrs.PADDING_RIGHT) != 0) {
autoLayoutInfo.addAttr(MarginRightAttr.generate(view.getPaddingRight(), base));
}
if ((attrs & Attrs.PADDING_BOTTOM) != 0) {
autoLayoutInfo.addAttr(MarginBottomAttr.generate(view.getPaddingBottom(), base));
}

// minWidth, maxWidth, minHeight, maxHeight
if ((attrs & Attrs.MIN_WIDTH) != 0) {
autoLayoutInfo.addAttr(MinWidthAttr.generate(MinWidthAttr.getMinWidth(view), base));
}
if ((attrs & Attrs.MAX_WIDTH) != 0) {
autoLayoutInfo.addAttr(MaxWidthAttr.generate(MaxWidthAttr.getMaxWidth(view), base));
}
if ((attrs & Attrs.MIN_HEIGHT) != 0) {
autoLayoutInfo.addAttr(MinHeightAttr.generate(MinHeightAttr.getMinHeight(view), base));
}
if ((attrs & Attrs.MAX_HEIGHT) != 0) {
autoLayoutInfo.addAttr(MaxHeightAttr.generate(MaxHeightAttr.getMaxHeight(view), base));
}

// textSize
if (view instanceof TextView) {
if ((attrs & Attrs.TEXTSIZE) != 0) {
autoLayoutInfo.addAttr(TextSizeAttr.generate((int) ((TextView) view).getTextSize(), base));
}
}
return autoLayoutInfo;
}

public void addAttr(AutoAttr autoAttr) {
autoAttrs.add(autoAttr);
}

@Override
public String toString() {
return "AutoLayoutInfo { autoAttrs = " + autoAttrs + " }";
}
}

getAttrFromView(View view, int attrs, int base)

遍历属性,重新计算属性的值并保存。

fillAttrs(View view)

遍历属性,将属性应用到给定的 View 上。


AutoUtils

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public class AutoUtils {
/**
* 会直接将view的LayoutParams上设置的width,height直接进行百分比处理
*
* @param view
*/
public static void auto(View view) {
autoSize(view);
autoPadding(view);
autoMargin(view);
autoTextSize(view, AutoAttr.BASE_DEFAULT);
}

/**
* @param view
* @param attrs #Attrs.WIDTH|Attrs.HEIGHT
* @param base AutoAttr.BASE_WIDTH|AutoAttr.BASE_HEIGHT|AutoAttr.BASE_DEFAULT
*/
public static void auto(View view, int attrs, int base) {
AutoLayoutInfo autoLayoutInfo = AutoLayoutInfo.getAttrFromView(view, attrs, base);
if (autoLayoutInfo != null) {
autoLayoutInfo.fillAttrs(view);
}
}

public static void autoTextSize(View view) {
auto(view, Attrs.TEXTSIZE, AutoAttr.BASE_DEFAULT);
}

public static void autoTextSize(View view, int base) {
auto(view, Attrs.TEXTSIZE, base);
}

public static void autoMargin(View view) {
auto(view, Attrs.MARGIN, AutoAttr.BASE_DEFAULT);
}

public static void autoMargin(View view, int base) {
auto(view, Attrs.MARGIN, base);
}

public static void autoPadding(View view) {
auto(view, Attrs.PADDING, AutoAttr.BASE_DEFAULT);
}

public static void autoPadding(View view, int base) {
auto(view, Attrs.PADDING, base);
}

public static void autoSize(View view) {
auto(view, Attrs.WIDTH | Attrs.HEIGHT, AutoAttr.BASE_DEFAULT);
}

public static void autoSize(View view, int base) {
auto(view, Attrs.WIDTH | Attrs.HEIGHT, base);
}

public static boolean autoed(View view) {
Object tag = view.getTag(R.id.id_tag_autolayout_size);
if (tag != null) {
return true;
}

view.setTag(R.id.id_tag_autolayout_size, "Just Identify");
return false;
}

public static float getPercentWidth1px() {
int screenWidth = AutoLayoutConifg.getInstance().getScreenWidth();
int designWidth = AutoLayoutConifg.getInstance().getDesignWidth();
return 1.0f * screenWidth / designWidth;
}

public static float getPercentHeight1px() {
int screenHeight = AutoLayoutConifg.getInstance().getScreenHeight();
int designHeight = AutoLayoutConifg.getInstance().getDesignHeight();
return 1.0f * screenHeight / designHeight;
}

public static int getPercentWidthSize(int val) {
int screenWidth = AutoLayoutConifg.getInstance().getScreenWidth();
int designWidth = AutoLayoutConifg.getInstance().getDesignWidth();
return (int) (val * 1.0f / designWidth * screenWidth);
}

public static int getPercentHeightSize(int val) {
int screenHeight = AutoLayoutConifg.getInstance().getScreenHeight();
int designHeight = AutoLayoutConifg.getInstance().getDesignHeight();
return (int) (val * 1.0f / designHeight * screenHeight);
}

public static int getPercentWidthSizeBigger(int val) {
int screenWidth = AutoLayoutConifg.getInstance().getScreenWidth();
int designWidth = AutoLayoutConifg.getInstance().getDesignWidth();

int res = val * screenWidth;
if (res % designWidth == 0) {
return res / designWidth;
} else {
return res / designWidth + 1;
}
}

public static int getPercentHeightSizeBigger(int val) {
int screenHeight = AutoLayoutConifg.getInstance().getScreenHeight();
int designHeight = AutoLayoutConifg.getInstance().getDesignHeight();

int res = val * screenHeight;
if (res % designHeight == 0) {
return res / designHeight;
} else {
return res / designHeight + 1;
}
}
}

getPercentWidth1px()

获取设计图中的1px在当前设备上的宽度。

getPercentHeight1px()

获取设计图中的1px在当前设备上的高度。

getPercentWidthSize(int val)

获取基于宽度计算的设计图中的指定的值在当前设备上的值。

getPercentHeightSize(int val)

获取基于高度计算的设计图中的指定的值在当前设备上的值。

getPercentWidthSizeBigger(int val)

获取基于宽度计算的设计图中的指定的值在当前设备上的值,当为0时,修改为1

getPercentHeightSizeBigger(int val)

获取基于高度计算的设计图中的指定的值在当前设备上的值,当为0时,修改为1


AutoAttr

判断是否未设置app:layout_auto_basewidthapp:layout_auto_baseheight,如果未设置,则判断该属性是基于宽度还是基于高度计算,并进行相应的计算;如果设置了基于宽度或高度计算,则进行对应的计算。

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public abstract class AutoAttr {
public static final int BASE_WIDTH = 1;
public static final int BASE_HEIGHT = 2;
public static final int BASE_DEFAULT = 3;

protected int pxVal;
protected int baseWidth;
protected int baseHeight;

public AutoAttr(int pxVal, int baseWidth, int baseHeight) {
this.pxVal = pxVal;
this.baseWidth = baseWidth;
this.baseHeight = baseHeight;
}

public void apply(View view) {
boolean log = view.getTag() != null && view.getTag().toString().equals("auto");
if (log) {
L.e("pxVal = " + pxVal + " ," + getClass().getSimpleName());
}
int val;
if (useDefault()) {
val = defaultBaseWidth() ? getPercentWidthSize() : getPercentHeightSize();
if (log) {
L.e("useDefault val = " + val);
}
} else if (baseWidth()) {
val = getPercentWidthSize();
if (log) {
L.e("baseWidth val = " + val);
}
} else {
val = getPercentHeightSize();
if (log) {
L.e("baseHeight val = " + val);
}
}
if (val > 0) {
val = Math.max(val, 1);// for very thin divider
}
execute(view, val);
}

protected boolean useDefault() {
return !contains(baseHeight, attrVal()) && !contains(baseWidth, attrVal());
}

protected boolean baseWidth() {
return contains(baseWidth, attrVal());
}

protected boolean contains(int baseVal, int flag) {
return (baseVal & flag) != 0;
}

protected int getPercentWidthSize() {
return AutoUtils.getPercentWidthSizeBigger(pxVal);
}

protected int getPercentHeightSize() {
return AutoUtils.getPercentHeightSizeBigger(pxVal);
}

@Override
public String toString() {
return "AutoAttr{" +
"pxVal = " + pxVal +
", baseWidth = " + baseWidth() +
", defaultBaseWidth = " + defaultBaseWidth() +
'}';
}

protected abstract int attrVal();

protected abstract boolean defaultBaseWidth();

protected abstract void execute(View view, int val);
}

attrVal()

该属性在attrs.xml中对应的值。

defaultBaseWidth()

是否默认依赖于宽度进行百分比计算。

execute(View view, int val)

将属性修改后的值替换给对应的属性。

apply(View view)

计算属性的值并将属性修改后的值替换给对应的属性。

useDefault()

判断是否未设置app:layout_auto_basewidthapp:layout_auto_baseheight

baseWidth()

判断是否设置了app:layout_auto_basewidth

contains(int baseVal, int flag)

判断是否对应的标志位是否置为了1

getPercentWidthSize()

基于宽度计算百分比的值。

getPercentHeightSize()

基于高度计算百分比的值。


AutoLayoutActivity

继承AutoLayoutActivity的 Activity 可以使布局实现百分比化。

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public class AutoLayoutActivity extends AppCompatActivity {
private static final String LAYOUT_LINEARLAYOUT = "LinearLayout";
private static final String LAYOUT_FRAMELAYOUT = "FrameLayout";
private static final String LAYOUT_RELATIVELAYOUT = "RelativeLayout";

@Override
public View onCreateView(String name, Context context, AttributeSet attrs) {
View view = null;
switch (name) {
case LAYOUT_FRAMELAYOUT:
view = new AutoFrameLayout(context, attrs);
break;
case LAYOUT_LINEARLAYOUT:
view = new AutoLinearLayout(context, attrs);
break;
case LAYOUT_RELATIVELAYOUT:
view = new AutoRelativeLayout(context, attrs);
break;
}
if (view != null) {
return view;
}

return super.onCreateView(name, context, attrs);
}
}

onCreateView(String name, Context context, AttributeSet attrs)

替换LinearLayoutAutoLinearLayout,替换FrameLayoutAutoFrameLayout,替换RelativeLayoutAutoRelativeLayout


AutoRelativeLayout

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public class AutoRelativeLayout extends RelativeLayout {
private final AutoLayoutHelper mHelper = new AutoLayoutHelper(this);

public AutoRelativeLayout(Context context) {
super(context);
}

public AutoRelativeLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}

public AutoRelativeLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}

@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new LayoutParams(getContext(), attrs);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (!isInEditMode()) {
mHelper.adjustChildren();
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

public static class LayoutParams extends RelativeLayout.LayoutParams implements AutoLayoutHelper.AutoLayoutParams {
private AutoLayoutInfo mAutoLayoutInfo;

public LayoutParams(Context c, AttributeSet attrs) {
super(c, attrs);
mAutoLayoutInfo = AutoLayoutHelper.getAutoLayoutInfo(c, attrs);
}

public LayoutParams(int width, int height) {
super(width, height);
}

public LayoutParams(ViewGroup.LayoutParams source) {
super(source);
}

public LayoutParams(MarginLayoutParams source) {
super(source);
}

@Override
public AutoLayoutInfo getAutoLayoutInfo() {
return mAutoLayoutInfo;
}
}
}

generateLayoutParams(AttributeSet attrs)

当父容器添加子 View 时调用。返回内部类LayoutParams的对象。



AutoLayout 代码解读
https://weichao.io/3b716defb206/
作者
魏超
发布于
2018年2月16日
更新于
2018年2月16日
许可协议