package org.yczbj.ycvideoplayer; import android.app.Activity; import android.app.Application; import android.content.ComponentCallbacks; import android.content.Context; import android.content.res.Configuration; import android.os.Build; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.annotation.RequiresApi; import android.util.DisplayMetrics; /** * <pre> * @author yangchong * blog : * time : 2018/9/14 * desc : 头条适配方案简易版,测试用,注意不要用到正式版 * revise: * </pre> */ public class ScreenDensityUtils { /* * 1.先在application中使用setup()方法初始化一下 * 2.手动在Activity中调用match()方法做适配,必须在setContentView()之前 * 3.建议使用dp做宽度适配,大多数时候宽度适配才是主流需要 * 4.个人觉得在写布局的时候,可以多用dp,如果是使用px,建议转化成dp * 5.入侵性很低,不需要改动原来的代码 */ /** * 屏幕适配的基准 */ public static final int MATCH_BASE_WIDTH = 0; public static final int MATCH_BASE_HEIGHT = 1; /** * 适配单位 */ public static final int MATCH_UNIT_DP = 0; public static final int MATCH_UNIT_PT = 1; // 适配信息 private static MatchInfo sMatchInfo; // Activity 的生命周期监测 private static Application.ActivityLifecycleCallbacks mActivityLifecycleCallback; private ScreenDensityUtils() { throw new UnsupportedOperationException("u can't instantiate me..."); } /** * 初始化 * @param application 需要在application中初始化 */ public static void setup(@NonNull final Application application) { /* //获取屏幕分辨率信息的三种方法 //第一种 DisplayMetrics metrics = new DisplayMetrics(); Display display = activity.getWindowManager().getDefaultDisplay(); display.getMetrics(metrics); //第二种 DisplayMetrics metrics= activity.getResources().getDisplayMetrics(); //第三种 Resources.getSystem().getDisplayMetrics(); */ //注意这个是获取系统的displayMetrics final DisplayMetrics displayMetrics = application.getResources().getDisplayMetrics(); if (sMatchInfo == null) { // 记录系统的原始值 sMatchInfo = new MatchInfo(); sMatchInfo.setScreenWidth(displayMetrics.widthPixels); sMatchInfo.setScreenHeight(displayMetrics.heightPixels); sMatchInfo.setAppDensity(displayMetrics.density); sMatchInfo.setAppDensityDpi(displayMetrics.densityDpi); sMatchInfo.setAppScaledDensity(displayMetrics.scaledDensity); sMatchInfo.setAppXdpi(displayMetrics.xdpi); } // 添加字体变化的监听 // 调用 Application#registerComponentCallbacks 注册下 onConfigurationChanged 监听即可。 application.registerComponentCallbacks(new ComponentCallbacks() { @Override public void onConfigurationChanged(Configuration newConfig) { // 字体改变后,将 appScaledDensity 重新赋值 if (newConfig != null && newConfig.fontScale > 0) { float scaledDensity = displayMetrics.scaledDensity; sMatchInfo.setAppScaledDensity(scaledDensity); } } @Override public void onLowMemory() { } }); } /** * 在 application 中全局激活适配(也可单独使用 match() 方法在指定页面中配置适配) */ @RequiresApi(api = Build.VERSION_CODES.ICE_CREAM_SANDWICH) public static void register(@NonNull final Application application, final float designSize, final int matchBase, final int matchUnit) { if (mActivityLifecycleCallback == null) { mActivityLifecycleCallback = new Application.ActivityLifecycleCallbacks() { @Override public void onActivityCreated(Activity activity, Bundle savedInstanceState) { if (activity != null) { match(activity, designSize, matchBase, matchUnit); } } @Override public void onActivityStarted(Activity activity) { } @Override public void onActivityResumed(Activity activity) { } @Override public void onActivityPaused(Activity activity) { } @Override public void onActivityStopped(Activity activity) { } @Override public void onActivitySaveInstanceState(Activity activity, Bundle outState) { } @Override public void onActivityDestroyed(Activity activity) { } }; application.registerActivityLifecycleCallbacks(mActivityLifecycleCallback); } } /** * 全局取消所有的适配 */ @RequiresApi(api = Build.VERSION_CODES.ICE_CREAM_SANDWICH) public static void unregister(@NonNull final Application application, @NonNull int... matchUnit) { if (mActivityLifecycleCallback != null) { application.unregisterActivityLifecycleCallbacks(mActivityLifecycleCallback); mActivityLifecycleCallback = null; } for (int unit : matchUnit) { cancelMatch(application, unit); } } /** * 适配屏幕(放在 Activity 的 setContentView() 之前执行) * * @param context 上下文 * @param designSize 设计图的尺寸 */ public static void match(@NonNull final Context context, final float designSize) { match(context, designSize, MATCH_BASE_WIDTH, MATCH_UNIT_DP); } /** * 适配屏幕(放在 Activity 的 setContentView() 之前执行) * * @param context 上下文 * @param designSize 设计图的尺寸 * @param matchBase 适配基准 */ public static void match(@NonNull final Context context, final float designSize, int matchBase) { match(context, designSize, matchBase, MATCH_UNIT_DP); } /** * 适配屏幕(放在 Activity 的 setContentView() 之前执行) * * @param context 上下文 * @param designSize 设计图的尺寸 * @param matchBase 适配基准 * @param matchUnit 使用的适配单位 */ private static void match(@NonNull final Context context, final float designSize, int matchBase, int matchUnit) { if (designSize == 0) { throw new UnsupportedOperationException("The designSize cannot be equal to 0"); } if (matchUnit == MATCH_UNIT_DP) { matchByDP(context, designSize, matchBase); } else if (matchUnit == MATCH_UNIT_PT) { matchByPT(context, designSize, matchBase); } } /** * 重置适配信息,取消适配 */ public static void cancelMatch(@NonNull final Context context) { cancelMatch(context, MATCH_UNIT_DP); cancelMatch(context, MATCH_UNIT_PT); } /** * 重置适配信息,取消适配 * * @param context 上下文 * @param matchUnit 需要取消适配的单位 */ private static void cancelMatch(@NonNull final Context context, int matchUnit) { if (sMatchInfo != null) { final DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics(); if (matchUnit == MATCH_UNIT_DP) { if (displayMetrics.density != sMatchInfo.getAppDensity()) { displayMetrics.density = sMatchInfo.getAppDensity(); } if (displayMetrics.densityDpi != sMatchInfo.getAppDensityDpi()) { displayMetrics.densityDpi = (int) sMatchInfo.getAppDensityDpi(); } if (displayMetrics.scaledDensity != sMatchInfo.getAppScaledDensity()) { displayMetrics.scaledDensity = sMatchInfo.getAppScaledDensity(); } } else if (matchUnit == MATCH_UNIT_PT) { if (displayMetrics.xdpi != sMatchInfo.getAppXdpi()) { displayMetrics.xdpi = sMatchInfo.getAppXdpi(); } } } } public static MatchInfo getMatchInfo() { return sMatchInfo; } /** * 使用 dp 作为适配单位(适合在新项目中使用,在老项目中使用会对原来既有的 dp 值产生影响) * <br> * <ul> * dp 与 px 之间的换算: * <li> px = density * dp </li> * <li> density = dpi / 160 </li> * <li> px = dp * (dpi / 160) </li> * </ul> * * @param context 上下文 * @param designSize 设计图的宽/高(单位: dp) * @param base 适配基准 */ private static void matchByDP(@NonNull final Context context, final float designSize, int base) { final float targetDensity; if (base == MATCH_BASE_WIDTH) { targetDensity = sMatchInfo.getScreenWidth() * 1f / designSize; } else if (base == MATCH_BASE_HEIGHT) { targetDensity = sMatchInfo.getScreenHeight() * 1f / designSize; } else { targetDensity = sMatchInfo.getScreenWidth() * 1f / designSize; } final int targetDensityDpi = (int) (targetDensity * 160); final float targetScaledDensity = targetDensity * (sMatchInfo.getAppScaledDensity() / sMatchInfo.getAppDensity()); final DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics(); displayMetrics.density = targetDensity; displayMetrics.densityDpi = targetDensityDpi; displayMetrics.scaledDensity = targetScaledDensity; } /** * 使用 pt 作为适配单位(因为 pt 比较冷门,新老项目皆适合使用;也可作为 dp 适配的补充, * 在需要同时适配宽度和高度时,使用 pt 来适配 dp 未适配的宽度或高度) * <br/> * <p> pt 转 px 算法: pt * metrics.xdpi * (1.0f/72) </p> * * @param context 上下文 * @param designSize 设计图的宽/高(单位: pt) * @param base 适配基准 */ private static void matchByPT(@NonNull final Context context, final float designSize, int base) { final float targetXdpi; if (base == MATCH_BASE_WIDTH) { targetXdpi = sMatchInfo.getScreenWidth() * 72f / designSize; } else if (base == MATCH_BASE_HEIGHT) { targetXdpi = sMatchInfo.getScreenHeight() * 72f / designSize; } else { targetXdpi = sMatchInfo.getScreenWidth() * 72f / designSize; } final DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics(); displayMetrics.xdpi = targetXdpi; } /** * 适配信息 */ private static class MatchInfo { private int screenWidth; private int screenHeight; private float appDensity; private float appDensityDpi; private float appScaledDensity; private float appXdpi; int getScreenWidth() { return screenWidth; } void setScreenWidth(int screenWidth) { this.screenWidth = screenWidth; } int getScreenHeight() { return screenHeight; } void setScreenHeight(int screenHeight) { this.screenHeight = screenHeight; } float getAppDensity() { return appDensity; } void setAppDensity(float appDensity) { this.appDensity = appDensity; } float getAppDensityDpi() { return appDensityDpi; } void setAppDensityDpi(float appDensityDpi) { this.appDensityDpi = appDensityDpi; } float getAppScaledDensity() { return appScaledDensity; } void setAppScaledDensity(float appScaledDensity) { this.appScaledDensity = appScaledDensity; } float getAppXdpi() { return appXdpi; } void setAppXdpi(float appXdpi) { this.appXdpi = appXdpi; } } }