详解Android中的沉浸式状态栏效果实例

setContentView(R.layout.activity_main); //再该方法后执行if (Build.VERSION.SDK_INT >= 21) {  View decorView = getWindow().getDecorView();  int option = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN      | View.SYSTEM_UI_FLAG_LAYOUT_STABLE;  decorView.setSystemUiVisibility(option);  getWindow().setStatusBarColor(Color.TRANSPARENT);}ActionBar actionBar = getSupportActionBar();actionBar.hide();

android:fitsSystemWindows="true"android:clipToPadding="true"

private void initState() {     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {      //透明状态栏       getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);      //透明导航栏       getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);      }    }

package com.xiaoyuan;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.drawable.Drawable;import android.os.Build;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.view.animation.AlphaAnimation;import android.widget.ScrollView;import java.util.ArrayList;/** * @author Emil Sj�lander - sjolander.emil@gmail.com */public class StickyScrollView extends ScrollView {  /**   * Tag for views that should stick and have constant drawing. e.g.   * TextViews, ImageViews etc   */  public static final String STICKY_TAG = "sticky";  /**   * Flag for views that should stick and have non-constant drawing. e.g.   * Buttons, ProgressBars etc   */  public static final String FLAG_NONCONSTANT = "-nonconstant";  /**   * Flag for views that have aren't fully opaque   */  public static final String FLAG_HASTRANSPARANCY = "-hastransparancy";  /**   * Default height of the shadow peeking out below the stuck view.   */  private static final int DEFAULT_SHADOW_HEIGHT = 10; // dp;  /**   * XKJ add for add 50dp offset of top   */  private static int MIN_STICK_TOP = 100;// px  //  private static final int MIN_STICK_TOP = 0;  private ArrayList<View> stickyViews;  private View currentlyStickingView;  private float stickyViewTopOffset;  private int stickyViewLeftOffset;  private boolean redirectTouchesToStickyView;  private boolean clippingToPadding;  private boolean clipToPaddingHasBeenSet;  private int mShadowHeight;  private Drawable mShadowDrawable;  private OnScrollChangedListener mOnScrollHandler = null;  private IOnScrollToEnd mOnScrollToEnd = null;  private final Runnable invalidateRunnable = new Runnable() {    @Override    public void run() {      if (currentlyStickingView != null) {        int l = getLeftForViewRelativeOnlyChild(currentlyStickingView);        int t = getBottomForViewRelativeOnlyChild(currentlyStickingView);        int r = getRightForViewRelativeOnlyChild(currentlyStickingView);        int b = (int) (getScrollY() + (currentlyStickingView.getHeight() + stickyViewTopOffset));        invalidate(l, t, r, b);      }      postDelayed(this, 16);    }  };  public StickyScrollView(Context context) {    this(context, null);  }  public StickyScrollView(Context context, AttributeSet attrs) {    this(context, attrs, android.R.attr.scrollViewStyle);  }  public StickyScrollView(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);    setup();    TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.StickyScrollView, defStyle, 0);    final float density = context.getResources().getDisplayMetrics().density;    int defaultShadowHeightInPix = (int) (DEFAULT_SHADOW_HEIGHT * density + 0.5f);    mShadowHeight = a.getDimensionPixelSize(R.styleable.StickyScrollView_stuckShadowHeight,        defaultShadowHeightInPix);    int shadowDrawableRes = a.getResourceId(R.styleable.StickyScrollView_stuckShadowDrawable, -1);    if (shadowDrawableRes != -1) {      mShadowDrawable = context.getResources().getDrawable(shadowDrawableRes);    }    a.recycle();  }  /**   * Sets the height of the shadow drawable in pixels.   *   * @param height   */  public void setShadowHeight(int height) {    mShadowHeight = height;  }  public void setup() {    stickyViews = new ArrayList<View>();  }  private int getLeftForViewRelativeOnlyChild(View v) {    int left = v.getLeft();    while (v.getParent() != getChildAt(0)) {      v = (View) v.getParent();      left += v.getLeft();    }    return left;  }  private int getTopForViewRelativeOnlyChild(View v) {    int top = v.getTop();    while (v.getParent() != getChildAt(0)) {      v = (View) v.getParent();      top += v.getTop();    }    return top;  }  private int getRightForViewRelativeOnlyChild(View v) {    int right = v.getRight();    while (v.getParent() != getChildAt(0)) {      v = (View) v.getParent();      right += v.getRight();    }    return right;  }  private int getBottomForViewRelativeOnlyChild(View v) {    int bottom = v.getBottom();    while (v.getParent() != getChildAt(0)) {      v = (View) v.getParent();      bottom += v.getBottom();    }    return bottom;  }  @Override  protected void onLayout(boolean changed, int l, int t, int r, int b) {    super.onLayout(changed, l, t, r, b);    if (!clipToPaddingHasBeenSet) {      clippingToPadding = true;    }    notifyHierarchyChanged();  }  @Override  public void setClipToPadding(boolean clipToPadding) {    super.setClipToPadding(clipToPadding);    clippingToPadding = clipToPadding;    clipToPaddingHasBeenSet = true;  }  @Override  public void addView(View child) {    super.addView(child);    findStickyViews(child);  }  @Override  public void addView(View child, int index) {    super.addView(child, index);    findStickyViews(child);  }  @Override  public void addView(View child, int index, android.view.ViewGroup.LayoutParams params) {    super.addView(child, index, params);    findStickyViews(child);  }  @Override  public void addView(View child, int width, int height) {    super.addView(child, width, height);    findStickyViews(child);  }  @Override  public void addView(View child, android.view.ViewGroup.LayoutParams params) {    super.addView(child, params);    findStickyViews(child);  }  @Override  protected void dispatchDraw(Canvas canvas) {    super.dispatchDraw(canvas);    if (currentlyStickingView != null) {      canvas.save();      canvas.translate(getPaddingLeft() + stickyViewLeftOffset, getScrollY() + stickyViewTopOffset          + (clippingToPadding ? getPaddingTop() : 0));      canvas.clipRect(0, (clippingToPadding ? -stickyViewTopOffset : 0), getWidth() - stickyViewLeftOffset,          currentlyStickingView.getHeight() + mShadowHeight + 1);      if (mShadowDrawable != null) {        int left = 0;        int right = currentlyStickingView.getWidth();        int top = currentlyStickingView.getHeight();        int bottom = currentlyStickingView.getHeight() + mShadowHeight;        mShadowDrawable.setBounds(left, top, right, bottom);        mShadowDrawable.draw(canvas);      }      canvas.clipRect(0, (clippingToPadding ? -stickyViewTopOffset : 0), getWidth(),          currentlyStickingView.getHeight());      if (getStringTagForView(currentlyStickingView).contains(FLAG_HASTRANSPARANCY)) {        showView(currentlyStickingView);        currentlyStickingView.draw(canvas);        hideView(currentlyStickingView);      } else {        currentlyStickingView.draw(canvas);      }      canvas.restore();    }  }  @Override  public boolean dispatchTouchEvent(MotionEvent ev) {    if (ev.getAction() == MotionEvent.ACTION_DOWN) {      redirectTouchesToStickyView = true;    }    if (redirectTouchesToStickyView) {      redirectTouchesToStickyView = currentlyStickingView != null;      if (redirectTouchesToStickyView) {        redirectTouchesToStickyView = ev.getY() <= (currentlyStickingView.getHeight() + stickyViewTopOffset)            && ev.getX() >= getLeftForViewRelativeOnlyChild(currentlyStickingView)            && ev.getX() <= getRightForViewRelativeOnlyChild(currentlyStickingView);      }    } else if (currentlyStickingView == null) {      redirectTouchesToStickyView = false;    }    if (redirectTouchesToStickyView) {      ev.offsetLocation(0, -1          * ((getScrollY() + stickyViewTopOffset) - getTopForViewRelativeOnlyChild(currentlyStickingView)));      // XKJ add TODO: remove this      currentlyStickingView.invalidate();    }    return super.dispatchTouchEvent(ev);  }  private boolean hasNotDoneActionDown = true;  @Override  public boolean onTouchEvent(MotionEvent ev) {    if (redirectTouchesToStickyView) {      ev.offsetLocation(0,          ((getScrollY() + stickyViewTopOffset) - getTopForViewRelativeOnlyChild(currentlyStickingView)));    }    if (ev.getAction() == MotionEvent.ACTION_DOWN) {      hasNotDoneActionDown = false;    }    if (hasNotDoneActionDown) {      MotionEvent down = MotionEvent.obtain(ev);      down.setAction(MotionEvent.ACTION_DOWN);      super.onTouchEvent(down);      hasNotDoneActionDown = false;    }    if (ev.getAction() == MotionEvent.ACTION_UP || ev.getAction() == MotionEvent.ACTION_CANCEL) {      hasNotDoneActionDown = true;    }    return super.onTouchEvent(ev);  }  @Override  protected void onScrollChanged(int l, int t, int oldl, int oldt) {    super.onScrollChanged(l, t, oldl, oldt);    doTheStickyThing();    if (mOnScrollHandler != null) {      mOnScrollHandler.onScrollChanged(l, t, oldl, oldt);    }    int maxScroll = getChildAt(0).getHeight() - getHeight();    if (getChildCount() > 0 && t == maxScroll) {      if (mOnScrollToEnd != null) {        mOnScrollToEnd.onScrollToEnd();      }    }  }  public void setOnScrollListener(OnScrollChangedListener handler) {    mOnScrollHandler = handler;  }  public interface OnScrollChangedListener {    public void onScrollChanged(int l, int t, int oldl, int oldt);  }  public interface IOnScrollToEnd {    public void onScrollToEnd();  }  public void setOnScrollToEndListener(IOnScrollToEnd handler) {    mOnScrollToEnd = handler;  }  private void doTheStickyThing() {    View viewThatShouldStick = null;    View approachingView = null;    for (View v : stickyViews) {      int viewTop = getTopForViewRelativeOnlyChild(v) - getScrollY() + (clippingToPadding ? 0 : getPaddingTop())          - MIN_STICK_TOP;// add 50dp      if (viewTop <= 0) {        if (viewThatShouldStick == null            || viewTop > (getTopForViewRelativeOnlyChild(viewThatShouldStick) - getScrollY() + (clippingToPadding ? 0            : getPaddingTop()))) {          viewThatShouldStick = v;        }      } else {        if (approachingView == null            || viewTop < (getTopForViewRelativeOnlyChild(approachingView) - getScrollY() + (clippingToPadding ? 0            : getPaddingTop()))) {          approachingView = v;        }      }    }    if (viewThatShouldStick != null) {      stickyViewTopOffset = approachingView == null ? MIN_STICK_TOP : Math.min(MIN_STICK_TOP,          getTopForViewRelativeOnlyChild(approachingView) - getScrollY()              + (clippingToPadding ? 0 : getPaddingTop()) - viewThatShouldStick.getHeight());      if (viewThatShouldStick != currentlyStickingView) {        if (currentlyStickingView != null) {          stopStickingCurrentlyStickingView();        }        // only compute the left offset when we start sticking.        stickyViewLeftOffset = getLeftForViewRelativeOnlyChild(viewThatShouldStick);        startStickingView(viewThatShouldStick);      }    } else if (currentlyStickingView != null) {      stopStickingCurrentlyStickingView();    }  }  private void startStickingView(View viewThatShouldStick) {    currentlyStickingView = viewThatShouldStick;    if (getStringTagForView(currentlyStickingView).contains(FLAG_HASTRANSPARANCY)) {      hideView(currentlyStickingView);    }    if (((String) currentlyStickingView.getTag()).contains(FLAG_NONCONSTANT)) {      post(invalidateRunnable);    }  }  private void stopStickingCurrentlyStickingView() {    if (getStringTagForView(currentlyStickingView).contains(FLAG_HASTRANSPARANCY)) {      showView(currentlyStickingView);    }    currentlyStickingView = null;    removeCallbacks(invalidateRunnable);  }  /**   * Notify that the sticky attribute has been added or removed from one or   * more views in the View hierarchy   */  public void notifyStickyAttributeChanged() {    notifyHierarchyChanged();  }  private void notifyHierarchyChanged() {    if (currentlyStickingView != null) {      stopStickingCurrentlyStickingView();    }    stickyViews.clear();    findStickyViews(getChildAt(0));    doTheStickyThing();    invalidate();  }  private void findStickyViews(View v) {    if (v instanceof ViewGroup) {      ViewGroup vg = (ViewGroup) v;      for (int i = 0; i < vg.getChildCount(); i++) {        String tag = getStringTagForView(vg.getChildAt(i));        if (tag != null && tag.contains(STICKY_TAG)) {          stickyViews.add(vg.getChildAt(i));        } else if (vg.getChildAt(i) instanceof ViewGroup) {          findStickyViews(vg.getChildAt(i));        }      }    } else {      String tag = (String) v.getTag();      if (tag != null && tag.contains(STICKY_TAG)) {        stickyViews.add(v);      }    }  }  private String getStringTagForView(View v) {    Object tagObject = v.getTag();    return String.valueOf(tagObject);  }  private void hideView(View v) {    if (Build.VERSION.SDK_INT >= 11) {      v.setAlpha(0);    } else {      AlphaAnimation anim = new AlphaAnimation(1, 0);      anim.setDuration(0);      anim.setFillAfter(true);      v.startAnimation(anim);    }  }  private void showView(View v) {    if (Build.VERSION.SDK_INT >= 11) {      v.setAlpha(1);    } else {      AlphaAnimation anim = new AlphaAnimation(0, 1);      anim.setDuration(0);      anim.setFillAfter(true);      v.startAnimation(anim);    }  }  /**   * 设置悬浮高度   * @param height   */  public void setStickTop(int height) {    MIN_STICK_TOP = height;  }  /**   * 解决vviewpager在scrollview滑动冲突的问题   */  // 滑动距离及坐标  private float xDistance, yDistance, xLast, yLast;  @Override  public boolean onInterceptTouchEvent(MotionEvent ev) {    switch (ev.getAction()) {      case MotionEvent.ACTION_DOWN:        xDistance = yDistance = 0f;        xLast = ev.getX();        yLast = ev.getY();        break;      case MotionEvent.ACTION_MOVE:        final float curX = ev.getX();        final float curY = ev.getY();        xDistance += Math.abs(curX - xLast);        yDistance += Math.abs(curY - yLast);//        com.ihaveu.utils.Log.i("test", "curx:"+curX+",cury:"+curY+",xlast:"+xLast+",ylast:"+yLast);//        xLast = curX;//        yLast = curY;        if (xDistance > yDistance) {          return false;        }    }    return super.onInterceptTouchEvent(ev);  }}

 package com.xiaoyuan;import android.graphics.Color;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.view.ViewTreeObserver;import android.widget.FrameLayout;import android.widget.LinearLayout;import android.widget.RelativeLayout;import android.widget.TextView;import com.jaeger.library.StatusBarUtil;public class MainActivity extends AppCompatActivity implements View.OnClickListener, StickyScrollView.OnScrollChangedListener {  TextView oneTextView, twoTextView;  private StickyScrollView stickyScrollView;  private int height;  private LinearLayout llContent;  private RelativeLayout llTitle;  private FrameLayout frameLayout;  private TextView title;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    initView();    initListeners();  }  /**   * 初始化View   */  private void initView() {    stickyScrollView = (StickyScrollView) findViewById(R.id.scrollView);    frameLayout = (FrameLayout) findViewById(R.id.tabMainContainer);    title = (TextView) findViewById(R.id.title);    oneTextView = (TextView) findViewById(R.id.infoText);    llContent = (LinearLayout) findViewById(R.id.ll_content);    llTitle = (RelativeLayout) findViewById(R.id.ll_good_detail);    oneTextView.setOnClickListener(this);    twoTextView = (TextView) findViewById(R.id.secondText);    twoTextView.setOnClickListener(this);    stickyScrollView.setOnScrollListener(this);    StatusBarUtil.setTranslucentForImageView(MainActivity.this, 0, title);    FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) llTitle.getLayoutParams();    params.setMargins(0, getStatusHeight(), 0, 0);    llTitle.setLayoutParams(params);    //默认设置一个Frg    getSupportFragmentManager().beginTransaction().replace(R.id.tabMainContainer, Fragment.newInstance()).commit();  }  /**   * 获取状态栏高度   *   * @return   */  private int getStatusHeight() {    int resourceId = MainActivity.this.getResources().getIdentifier("status_bar_height", "dimen", "android");    return getResources().getDimensionPixelSize(resourceId);  }  @Override  public void onClick(View v) {    if (v.getId() == R.id.infoText) {      getSupportFragmentManager().beginTransaction().replace(R.id.tabMainContainer, Fragment.newInstance()).commit();    } else if (v.getId() == R.id.secondText) {      getSupportFragmentManager().beginTransaction().replace(R.id.tabMainContainer, Fragment1.newInstance()).commit();    }  }  private void initListeners() {    //获取内容总高度    final ViewTreeObserver vto = llContent.getViewTreeObserver();    vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {      @Override      public void onGlobalLayout() {        height = llContent.getHeight();        //注意要移除        llContent.getViewTreeObserver()            .removeGlobalOnLayoutListener(this);      }    });    //获取Fragment高度    ViewTreeObserver viewTreeObserver = frameLayout.getViewTreeObserver();    viewTreeObserver.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {      @Override      public void onGlobalLayout() {        height = height - frameLayout.getHeight();        //注意要移除        frameLayout.getViewTreeObserver()            .removeGlobalOnLayoutListener(this);      }    });    //获取title高度    ViewTreeObserver viewTreeObserver1 = llTitle.getViewTreeObserver();    viewTreeObserver1.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {      @Override      public void onGlobalLayout() {        height = height - llTitle.getHeight() - getStatusHeight();//计算滑动的总距离        stickyScrollView.setStickTop(llTitle.getHeight() + getStatusHeight());//设置距离多少悬浮        //注意要移除        llTitle.getViewTreeObserver()            .removeGlobalOnLayoutListener(this);      }    });  }  @Override  public void onScrollChanged(int l, int t, int oldl, int oldt) {    if (t <= 0) {      llTitle.setBackgroundColor(Color.argb((int) 0, 255, 255, 255));    } else if (t > 0 && t <= height) {      float scale = (float) t / height;      int alpha = (int) (255 * scale);      llTitle.setBackgroundColor(Color.argb((int) alpha, 227, 29, 26));//设置标题栏的透明度及颜色      StatusBarUtil.setTranslucentForImageView(MainActivity.this, alpha, title);//设置状态栏的透明度    } else { StatusBarUtil.setTranslucentForImageView(MainActivity.this, 0, title);      llTitle.setBackgroundColor(Color.argb((int) 255, 227, 29, 26));      StatusBarUtil.setTranslucentForImageView(MainActivity.this, 255, title);    }  }}