效果图
your_gif_from_mp4togif_com_1509756659012.gif
解析
上面这个界面分为三个部分，一个是最顶部的toolbar，中间的viewpager，最底部下导航栏，中间的viewpager目前没有什么内容，所以不必多说。这里主要做的就是ViewPager、导航栏、系统状态栏的渐变色，和tablayout的切换效果，以及沉浸式导航栏。
沉浸式状态栏
- 下面这些代码必须在setContentView前做，代码比较多比较长，需要好好理解。
getWindow().addFlags(
WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
manager = new SystemStatusManager(this);
manager.setStatusBarTintEnabled(true);
manager.setStatusBarTintResource(R.color.product_green);// 设置颜色
后面就可以通过managermanager.setStatusBarTintResource(color);来设置颜色
- SystemStatusManager类
用于管理系统状态栏的类
public class SystemStatusManager {
static {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
try {
Class c = Class.forName("android.os.SystemProperties");
Method m = c.getDeclaredMethod("get", String.class);
m.setAccessible(true);
sNavBarOverride = (String) m.invoke(null, "qemu.hw.mainkeys");
} catch (Throwable e) {
}
}
}
public static final int DEFAULT_TINT_COLOR = 0x99000000;
private static String sNavBarOverride;
private final SystemBarConfig mConfig;
private boolean mStatusBarAvailable;
private boolean mNavBarAvailable;
private boolean mStatusBarTintEnabled;
private boolean mNavBarTintEnabled;
private View mStatusBarTintView;
private View mNavBarTintView;
@SuppressLint("ResourceType")
public SystemStatusManager(Activity activity) {
Window window = activity.getWindow();
ViewGroup decorViewGroup = (ViewGroup) window.getDecorView();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
int[] attrs = {android.R.attr.windowTranslucentStatus,
android.R.attr.windowTranslucentNavigation};
TypedArray a = activity.obtainStyledAttributes(attrs);
mStatusBarAvailable = a.getBoolean(0, false);
mNavBarAvailable = a.getBoolean(1, false);
WindowManager.LayoutParams winParams = window.getAttributes();
int bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;
if ((winParams.flags & bits) != 0) {
mStatusBarAvailable = true;
}
bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION;
if ((winParams.flags & bits) != 0) {
mNavBarAvailable = true;
}
}
mConfig = new SystemBarConfig(activity, mStatusBarAvailable, mNavBarAvailable);
if (!mConfig.hasNavigtionBar()) {
mNavBarAvailable = false;
}
if (mStatusBarAvailable) {
setupStatusBarView(activity, decorViewGroup);
}
if (mNavBarAvailable) {
setupNavBarView(activity, decorViewGroup);
}
}
public void setStatusBarTintEnabled(boolean enabled) {
mStatusBarTintEnabled = enabled;
if (mStatusBarAvailable) {
mStatusBarTintView.setVisibility(enabled ? View.VISIBLE : View.GONE);
}
}
public void setNavigationBarTintEnabled(boolean enabled) {
mNavBarTintEnabled = enabled;
if (mNavBarAvailable) {
mNavBarTintView.setVisibility(enabled ? View.VISIBLE : View.GONE);
}
}
public void setTintColor(int color) {
setStatusBarTintColor(color);
setNavigationBarTintColor(color);
}
public void setTintResource(int res) {
setStatusBarTintResource(res);
setNavigationBarTintResource(res);
}
public void setTintDrawable(Drawable drawable) {
setStatusBarTintDrawable(drawable);
setNavigationBarTintDrawable(drawable);
}
public void setTintAlpha(float alpha) {
setStatusBarAlpha(alpha);
setNavigationBarAlpha(alpha);
}
public void setStatusBarTintColor(int color) {
if (mStatusBarAvailable) {
mStatusBarTintView.setBackgroundColor(color);
}
}
public void setStatusBarTintResource(int res) {
if (mStatusBarAvailable) {
mStatusBarTintView.setBackgroundResource(res);
}
}
public void setStatusBarTintDrawable(Drawable drawable) {
if (mStatusBarAvailable) {
mStatusBarTintView.setBackground(drawable);
}
}
public void setStatusBarAlpha(float alpha) {
if (mStatusBarAvailable) {
mStatusBarTintView.setAlpha(alpha);
}
}
public void setNavigationBarTintColor(int color){
if(mNavBarAvailable){
mNavBarTintView.setBackgroundColor(color);
}
}
public void setNavigationBarTintResource(int res){
if(mNavBarAvailable){
mNavBarTintView.setBackgroundResource(res);
}
}
public void setNavigationBarTintDrawable(Drawable drawable){
if(mNavBarAvailable){
mNavBarTintView.setBackground(drawable);
}
}
public void setNavigationBarAlpha(float alpha){
if(mNavBarAvailable){
mNavBarTintView.setAlpha(alpha);
}
}
public SystemBarConfig getConfig() {
return mConfig;
}
public boolean isStatusBarTintEnabled() {
return mStatusBarTintEnabled;
}
public boolean isNavBarTintEnabled() {
return mNavBarTintEnabled;
}
private void setupStatusBarView(Context context, ViewGroup decorViewGroup) {
mStatusBarTintView = new View(context);
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, mConfig.getStatusBarHeight());
params.gravity = Gravity.TOP;
if (mNavBarAvailable && !mConfig.isNavigationAtBottom()) {
params.rightMargin = mConfig.getNavigationBarWidth();
}
mStatusBarTintView.setLayoutParams(params);
mStatusBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);
mStatusBarTintView.setVisibility(View.GONE);
decorViewGroup.addView(mStatusBarTintView);
}
private void setupNavBarView(Context context, ViewGroup decorViewGroup) {
mNavBarTintView = new View(context);
FrameLayout.LayoutParams params;
if (mConfig.isNavigationAtBottom()) {
params = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT,
mConfig.getNavigationBarHeight());
params.gravity = Gravity.BOTTOM;
} else {
params = new FrameLayout.LayoutParams(mConfig.getNavigationBarWidth(),
FrameLayout.LayoutParams.MATCH_PARENT);
params.gravity = Gravity.RIGHT;
}
mNavBarTintView.setLayoutParams(params);
mNavBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);
mNavBarTintView.setVisibility(View.GONE);
decorViewGroup.addView(mNavBarTintView);
}
public static class SystemBarConfig {
private static final String STATUS_BAR_HEIGHT_RES_NAME = "status_bar_height";
private static final String NAV_BAR_HEIGHT_RES_NAME = "navigation_bar_height";
private static final String NAV_BAR_HEIGHT_LANDSCAPE_RES_NAME = "navigation_bar_height_landscape";
private static final String NAV_BAR_WIDTH_RES_NAME = "navigation_bar_width";
private static final String SHOW_NAV_BAR_RES_NAME = "config_showNavigationBar";
private final boolean mTranslucentStatusBar;
private final boolean mTranslucentNavBar;
private final int mStatusBarHeight;
private final int mActionBarHeight;
private final boolean mHasNavigationBar;
private final int mNavigationBarHeight;
private final int mNavigationBarWidth;
private final boolean mInPortrait;
private final float mSmallestWidthDp;
private SystemBarConfig(Activity activity, boolean translucentStatusBar, boolean traslucentNavBar) {
Resources res = activity.getResources();
mInPortrait = (res.getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT);
mSmallestWidthDp = getSmallestWidthDp(activity);
mStatusBarHeight = getInternalDimensionSize(res, STATUS_BAR_HEIGHT_RES_NAME);
mActionBarHeight = getActionBarHeight(activity);
mNavigationBarHeight = getNavigationBarHeight(activity);
mNavigationBarWidth = getNavigationBarWidth(activity);
mHasNavigationBar = (mNavigationBarHeight > 0);
mTranslucentStatusBar = translucentStatusBar;
mTranslucentNavBar = traslucentNavBar;
}
@TargetApi(14)
private int getActionBarHeight(Context context) {
int result = 0;
TypedValue tv = new TypedValue();
context.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true);
result = TypedValue.complexToDimensionPixelSize(tv.data, context.getResources().getDisplayMetrics());
return result;
}
@TargetApi(14)
private int getNavigationBarHeight(Context context) {
Resources res = context.getResources();
int result = 0;
if (hasNavBar(context)) {
String key;
if (mInPortrait) {
key = NAV_BAR_HEIGHT_RES_NAME;
} else {
key = NAV_BAR_HEIGHT_LANDSCAPE_RES_NAME;
}
return getInternalDimensionSize(res, key);
}
return result;
}
@TargetApi(14)
private int getNavigationBarWidth(Context context) {
Resources res = context.getResources();
int result = 0;
if (hasNavBar(context)) {
return getInternalDimensionSize(res, NAV_BAR_WIDTH_RES_NAME);
}
return result;
}
@TargetApi(14)
private boolean hasNavBar(Context context) {
Resources res = context.getResources();
int resourceId = res.getIdentifier(SHOW_NAV_BAR_RES_NAME, "bool", "android");
if (resourceId != 0) {
boolean hasNav = res.getBoolean(resourceId);
// check override flag (see static block)
if ("1".equals(sNavBarOverride)) {
hasNav = false;
} else if ("0".equals(sNavBarOverride)) {
hasNav = true;
}
return hasNav;
} else { // fallback
return !ViewConfiguration.get(context).hasPermanentMenuKey();
}
}
private int getInternalDimensionSize(Resources res, String key) {
int result = 0;
int resourceId = res.getIdentifier(key, "dimen", "android");
if (resourceId > 0) {
result = res.getDimensionPixelSize(resourceId);
}
return result;
}
@SuppressLint("NewApi")
private float getSmallestWidthDp(Activity activity) {
DisplayMetrics metrics = new DisplayMetrics();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
activity.getWindowManager().getDefaultDisplay().getRealMetrics(metrics);
} else {
activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
}
float widthDp = metrics.widthPixels / metrics.density;
float heightDp = metrics.heightPixels / metrics.density;
return Math.min(widthDp, heightDp);
}
/**
* Should a navigation bar appear at the bottom of the screen in the current
* device configuration? A navigation bar may appear on the right side of
* the screen in certain configurations.
*
* @return True if navigation should appear at the bottom of the screen, False otherwise.
*/
public boolean isNavigationAtBottom() {
return (mSmallestWidthDp >= 600 || mInPortrait);
}
/**
* Get the height of the system status bar.
*
* @return The height of the status bar (in pixels).
*/
public int getStatusBarHeight() {
return mStatusBarHeight;
}
/**
* Get the height of the action bar.
*
* @return The height of the action bar (in pixels).
*/
public int getActionBarHeight() {
return mActionBarHeight;
}
/**
* Does this device have a system navigation bar?
*
* @return True if this device uses soft key navigation, False otherwise.
*/
public boolean hasNavigtionBar() {
return mHasNavigationBar;
}
/**
* Get the height of the system navigation bar.
*
* @return The height of the navigation bar (in pixels). If the device does not have
* soft navigation keys, this will always return 0.
*/
public int getNavigationBarHeight() {
return mNavigationBarHeight;
}
/**
* Get the width of the system navigation bar when it is placed vertically on the screen.
*
* @return The width of the navigation bar (in pixels). If the device does not have
* soft navigation keys, this will always return 0.
*/
public int getNavigationBarWidth() {
return mNavigationBarWidth;
}
/**
* Get the layout inset for any system UI that appears at the top of the screen.
*
* @param withActionBar True to include the height of the action bar, False otherwise.
* @return The layout inset (in pixels).
*/
public int getPixelInsetTop(boolean withActionBar) {
return (mTranslucentStatusBar ? mStatusBarHeight : 0) + (withActionBar ? mActionBarHeight : 0);
}
/**
* Get the layout inset for any system UI that appears at the bottom of the screen.
*
* @return The layout inset (in pixels).
*/
public int getPixelInsetBottom() {
if (mTranslucentNavBar && isNavigationAtBottom()) {
return mNavigationBarHeight;
} else {
return 0;
}
}
/**
* Get the layout inset for any system UI that appears at the right of the screen.
*
* @return The layout inset (in pixels).
*/
public int getPixelInsetRight() {
if (mTranslucentNavBar && !isNavigationAtBottom()) {
return mNavigationBarWidth;
} else {
return 0;
}
}
}
}
ViewPager使用
viewpager的功能是使视图滑动，用于切换视图。它可以实现多视图的切换效果，在它其中可以添加其他的视图。
// 这里假设都初始化好了，所以就不写出初始化的代码了。
private ViewPager viewPager;
private List fragments;// 在这其中添加fragment就可以用于显示了。
private FragmentPagerAdapter pagerAdapter;
private FragmentManager fragmentManager;
一部分初始化的代码：
pagerAdapter = new FragmentPagerAdapter(fragmentManager) {
@Override
public Fragment getItem(int position) {
return fragments.get(position);
}
@Override
public int getCount() {
return fragments.size();
}
};
viewPager.setOffscreenPageLimit(3);
viewPager.setAdapter(pagerAdapter);
viewPager.setCurrentItem(0);
TabLayout实例
xml代码
一行代码： tabLayout.setupWithViewPager(viewPager); 就可以实现了
viewPager渐变色
// 变化的颜色
private final int green = 0xFF43CD80, blue = 0xFF11A0F8, yellow = 0xFFFFBB43, red = 0xFFB54B36;
// 实例代码
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
ArgbEvaluator evaluator = new ArgbEvaluator(); // ARGB求值器
int evaluate = blue; // 初始默认颜色
if (position == 0) {
evaluate = (Integer) evaluator.evaluate(positionOffset, green, blue); // 根据positionOffset和第0页~第1页的颜色转换范围取颜色值
} else if (position == 1) {
evaluate = (Integer) evaluator.evaluate(positionOffset, blue, yellow); // 根据positionOffset和第1页~第2页的颜色转换范围取颜色值
} else if (position == 2) {
evaluate = (Integer) evaluator.evaluate(positionOffset, yellow, red); // 根据positionOffset和第2页~第3页的颜色转换范围取颜色值
} else {
evaluate = red; // 最终第3页的颜色
}
// ((View)viewPager.getParent()).setBackgroundColor(evaluate); // 为ViewPager的父容器设置背景色
manager.setStatusBarTintColor(evaluate);// 切换状态栏的颜色
mainViewModel.setColor(evaluate);// 切换底部导航栏和toolbar的颜色。
}
@Override
public void onPageSelected(int position) {
}
@Override
public void onPageScrollStateChanged(int state) {
}
});