您好,登錄后才能下訂單哦!
本篇文章給大家分享的是有關(guān)怎么在Android中利用Scrollview實(shí)現(xiàn)一個(gè)滑動(dòng)漸變效果,小編覺(jué)得挺實(shí)用的,因此分享給大家學(xué)習(xí),希望大家閱讀完這篇文章后可以有所收獲,話不多說(shuō),跟著小編一起來(lái)看看吧。
public class MyScrollView extends ScrollView { private TranslucentListener mTranslucentListener; public void setTranslucentListener(TranslucentListener translucentListener) { this.mTranslucentListener = translucentListener; } public MyScrollView(Context context) { this(context, null); } public MyScrollView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public MyScrollView(Context context, AttributeSet attrs, int defStyleAttr) { this(context, attrs, defStyleAttr, 0); } public MyScrollView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); } @Override protected void onScrollChanged(int l, int t, int oldl, int oldt) { super.onScrollChanged(l, t, oldl, oldt); if (mTranslucentListener != null) { //ScrollView滑出高度 int scrollY = getScrollY(); //屏幕高度 int screenHeight = getContext().getResources().getDisplayMetrics().heightPixels; //有效滑動(dòng)距離為屏幕2分之一 // alpha = 滑動(dòng)高度/(screenHeight/3f) if (scrollY <= screenHeight / 2f) { Log.d(">>>>>>>>>", "ScrollView劃出高度:" + scrollY); Log.d(">>>>>>>>>", "屏幕高度:" + screenHeight); Log.d(">>>>>>>>>", "漸變值:" + (0 + scrollY / (screenHeight / 4f))); // 漸變的過(guò)程 1~0 mTranslucentListener.onTranslucent(0 + scrollY / (screenHeight /4f)); } } } }
Activity 設(shè)置
public class ToolbarActivity extends AppCompatActivity implements TranslucentListener { private Toolbar mToolBar; private MyScrollView mScrollView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_toobar); mToolBar = findViewById(R.id.id_toolbar); mScrollView = findViewById(R.id.id_scrollView); //初始化漸變?yōu)? mToolBar.setAlpha(0); //設(shè)置漸變回調(diào) mScrollView.setTranslucentListener(this); } @Override public void onTranslucent(float alpha) { mToolBar.setAlpha(alpha); } }
漸變回調(diào)接口
/** * @ClassName TranslucentListener * @Author rex * @Date 2021/1/27 17:38 */ public interface TranslucentListener { /** * 透明度的回調(diào)監(jiān)聽(tīng) * * @param alpha 0~1 透明度 */ public void onTranslucent(float alpha); }
布局文件
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <com.rex.rxhttpdemo.MyScrollView android:id="@+id/id_scrollView" android:layout_width="match_parent" android:layout_height="match_parent" android:clipChildren="false" android:clipToPadding="false" > <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <Button android:id="@+id/button1" android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button0" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button1" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button2" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button3" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button4" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button5" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button5" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button5" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button5" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button5" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button5" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button5" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button5" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button" /> <Button android:layout_width="match_parent" android:layout_height="match_parent" android:text="Button" /> </LinearLayout> </com.rex.rxhttpdemo.MyScrollView> <androidx.appcompat.widget.Toolbar android:id="@+id/id_toolbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@color/colorAccent" app:title="title" /> </RelativeLayout>
下滑顯示上滑漸變消失
/** * @ClassName MyScrollView * @Author Rex * @Date 2021/1/27 17:38 */ public class MyScrollView extends ScrollView { private TranslucentListener mTranslucentListener; public void setTranslucentListener(TranslucentListener translucentListener) { this.mTranslucentListener = translucentListener; } public MyScrollView(Context context) { this(context, null); } public MyScrollView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public MyScrollView(Context context, AttributeSet attrs, int defStyleAttr) { this(context, attrs, defStyleAttr, 0); } public MyScrollView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); } @Override protected void onScrollChanged(int l, int t, int oldl, int oldt) { super.onScrollChanged(l, t, oldl, oldt); if (mTranslucentListener != null) { //ScrollView滑出高度 int scrollY = getScrollY(); //屏幕高度 int screenHeight = getContext().getResources().getDisplayMetrics().heightPixels; //有效滑動(dòng)距離為屏幕2分之一 // alpha = 滑動(dòng)高度/(screenHeight/3f) if (scrollY <= screenHeight / 2f) { Log.d(">>>>>>>>>", "ScrollView劃出高度:" + scrollY); Log.d(">>>>>>>>>", "屏幕高度:" + screenHeight); Log.d(">>>>>>>>>", "漸變值:" + (1 - scrollY / (screenHeight / 4f))); // 漸變的過(guò)程 1~0 mTranslucentListener.onTranslucent(1 - scrollY / (screenHeight /4f)); } } } }
注意: 這里只是更改了 mTranslucentListener.onTranslucent 里的 漸變值
Activty 里 把初始化 mToolBar.setAlpha(0); 去掉
XML
<com.rex.rxhttpdemo.MyScrollView android:id="@+id/id_scrollView" android:layout_width="match_parent" android:layout_height="match_parent" android:clipChildren="false" android:clipToPadding="false" android:paddingTop="?attr/actionBarSize" > </com.rex.rxhttpdemo.MyScrollView>
xml 加入 paddingtop .
注意:
android:clipChildren=“false”
android:clipToPadding="false"
以上就是怎么在Android中利用Scrollview實(shí)現(xiàn)一個(gè)滑動(dòng)漸變效果,小編相信有部分知識(shí)點(diǎn)可能是我們?nèi)粘9ぷ鲿?huì)見(jiàn)到或用到的。希望你能通過(guò)這篇文章學(xué)到更多知識(shí)。更多詳情敬請(qǐng)關(guān)注億速云行業(yè)資訊頻道。
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點(diǎn)不代表本網(wǎng)站立場(chǎng),如果涉及侵權(quán)請(qǐng)聯(lián)系站長(zhǎng)郵箱:is@yisu.com進(jìn)行舉報(bào),并提供相關(guān)證據(jù),一經(jīng)查實(shí),將立刻刪除涉嫌侵權(quán)內(nèi)容。