最近更新了微信版本到6.2,发现里面有个非常好的体验,就是在第二个页面Activity能手势向右滑动返回,在手势滑动的过程中能看到第一个页面,这种体验非常赞,这里高仿了一下。这里使用的是v4包里面的SlidingPaneLayout来手势滑动,在下一篇博文中将采用SlidingMenu来高仿,下面是SlidingPaneLayout高仿后的效果,效果还是蛮不错的。
最重要的是,每一个页面都是Activity,而非Fragment哦,使用Activity和正常的Activity一样
这里给出demo下载地址github
下面讲一下实现的原理,里面有几个难点需要说一下
手势滑动
在滑动过程中看到第一个页面内容
解决方案:
手势滑动借用了v4包里面的SlidingPaneLayout,因为这个SlidingPaneLayout效果和我们要实现的效果非常像,所以就想着通过这个来改造,SlidingPaneLayout帮我们已经处理好了手势事件
在滑动过程中看到下面的Activity页面就非常简单了,只要把我们当前的Activity样式设置成透明就OK了
下面一步一步来讲解实现原理:
首先第一步:因为我们有的页面需要滑动返回,有的页面不需要滑动返回,所以这里抽取了一个父类BaseSwipeBackActivity,在你项目里需要加手势滑动返回的Activity,你只要继承BaseSwipeBackActivity就可以了,不需要的不用继承它。
这里先看一下BaseSwipeBackActivity的源码实现:
package com.hhl.swipebacksample; import android.os.Bundle; import android.support.v4.widget.SlidingPaneLayout; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.view.ViewGroup; import android.widget.FrameLayout; import java.lang.reflect.Field; /** * Created by hailonghan on 15/6/9. */ public abstract class BaseSwipeBackActivity extends AppCompatActivity implements SlidingPaneLayout.PanelSlideListener { public final static String TAG = BaseSwipeBackActivity.class.getCanonicalName(); SlidingPaneLayout mSlidingPaneLayout; FrameLayout mContainerFl; @Override protected void onCreate(Bundle savedInstanceState) { //TODO 通过反射来改变SlidingPanelayout的值 try { mSlidingPaneLayout = new SlidingPaneLayout(this); //属性 Field f_overHang = SlidingPaneLayout.class.getDeclaredField("mOverhangSize"); f_overHang.setAccessible(true); f_overHang.set(mSlidingPaneLayout, 0); mSlidingPaneLayout.setPanelSlideListener(this); mSlidingPaneLayout.setSliderFadeColor(getResources().getColor(android.R.color.transparent)); } catch (Exception e) { e.printStackTrace(); } super.onCreate(savedInstanceState); //添加两个view View leftView = new View(this); leftView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); mSlidingPaneLayout.addView(leftView, 0); mContainerFl = new FrameLayout(this); mContainerFl.setBackgroundColor(getResources().getColor(android.R.color.white)); mContainerFl.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); mSlidingPaneLayout.addView(mContainerFl, 1); } @Override public void setContentView(int id) { setContentView(getLayoutInflater().inflate(id, null)); } /* (non-Javadoc) * @see android.app.Activity#setContentView(android.view.View) */ @Override public void setContentView(View v) { setContentView(v, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); } /* (non-Javadoc) * @see android.app.Activity#setContentView(android.view.View, android.view.ViewGroup.LayoutParams) */ @Override public void setContentView(View v, ViewGroup.LayoutParams params) { super.setContentView(mSlidingPaneLayout, params); mContainerFl.removeAllViews(); mContainerFl.addView(v, params); } @Override public void onPanelClosed(View view) { } @Override public void onPanelOpened(View view) { finish(); this.overridePendingTransition(0, R.anim.slide_out_right); } @Override public void onPanelSlide(View view, float v) { } }
看onCreate方法,这里通过java反射修改了SlidingPaneLayout的属性mOverhangSize的值,因为这个值是个私有属性,默认值是32,这个值的大小是SlidingPaneLayout左菜单离右边屏幕边缘的距离,因为我们要左菜单全屏幕大小,所以要让mOverhangSize为0,这里通过java反射来修改,代码如下:
//TODO 通过反射来改变SlidingPanelayout的值 try { mSlidingPaneLayout = new SlidingPaneLayout(this); //mOverhangSize属性,意思就是左菜单离右边屏幕边缘的距离 Field f_overHang = SlidingPaneLayout.class.getDeclaredField("mOverhangSize"); f_overHang.setAccessible(true); //设置左菜单离右边屏幕边缘的距离为0,设置全屏 f_overHang.set(mSlidingPaneLayout, 0); mSlidingPaneLayout.setPanelSlideListener(this); mSlidingPaneLayout.setSliderFadeColor(getResources().getColor(android.R.color.transparent)); } catch (Exception e) { e.printStackTrace(); }
把左边菜单设置好全屏幕之后,我们给SlidingPaneLayout加两个子布局,一个是左侧菜单,一个是内容显示容器布局,左侧菜单布局我们要设置成透明的,因为在手势滑动的时候,我们要看到底下的Activity页面,而内容显示布局就不应该是透明的,这里我加了白色北背景,看下面代码:
//添加两个view,这是左侧菜单,因为Activity是透明的,这里就不用设置了 View leftView = new View(this); //设置全屏 leftView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); //添加到SlidingPaneLayout中 mSlidingPaneLayout.addView(leftView, 0); //内容布局,用来存放Activity布局用的 mContainerFl = new FrameLayout(this); //内容布局不应该是透明,这里加了白色背景 mContainerFl.setBackgroundColor(getResources().getColor(android.R.color.white)); //全屏幕显示 mContainerFl.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)); //添加到SlidingPaneLayout中 mSlidingPaneLayout.addView(mContainerFl, 1);
随着手势滑动,慢慢的显示出菜单,因为整个Activity是透明的,左侧菜单也是透明的,这样就可以透过左侧菜单看到下面的Activity页面,当左侧菜单完全打开后,我们要结束掉这个Activity,这里监听了SlidingPaneLayout的public void onPanelOpened(View view)方法,这个方法的意思就是菜单打开后执行的操作,我这里重写了这个方法,看代码如下:
@Override public void onPanelOpened(View view) { //菜单打开后,我们结束掉这个Activity finish(); this.overridePendingTransition(0, R.anim.slide_out_right); }
让菜单打开后结束掉这个Activity,这样就实现了手势滑动返回上一个页面
这样我们的BaseSwipeBackActivity就写好了,那怎么来用呢,这里我们创建一个NextActivity,继承之BaseSwipeBackActivity,其他的和普通的Activity都一样,看源码实现,其实非常简单:
package com.hhl.swipebacksample; import android.content.Intent; import android.graphics.Color; import android.os.Bundle; import android.view.View; import android.widget.RelativeLayout; import java.util.Random; //必须继承BaseSwipeBackActivity public class NextActivity extends BaseSwipeBackActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //设置布局,和普通Activity一样 setContentView(R.layout.activity_next); RelativeLayout containerRl = (RelativeLayout) findViewById(R.id.container); //随机色 Random random = new Random(); int red = random.nextInt(255); int green = random.nextInt(255); int blue = random.nextInt(255); containerRl.setBackgroundColor(Color.argb(255,red,green,blue)); } public void nextPage(View v) { startActivity(new Intent(this, NextActivity.class)); } }
AndroidManifest.xml声明NextActivity :
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.hhl.swipebacksample"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme"> <activity android:name=".MainActivity" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".NextActivity" android:label="@string/title_activity_next" android:theme="@style/JK.SwipeBack.Transparent.Theme"></activity> </application> </manifest>
这里添加了一个主题样式@style/JK.SwipeBack.Transparent.Theme,这里要把这个Activity设置成透明样式,这样才能透过这个Activity看到下面的Activity,@style/JK.SwipeBack.Transparent.Theme源码如下:
<resources xmlns:tools="http://schemas.android.com/tools"> <!-- Base application theme. --> <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar"> <!-- Customize your theme here. --> </style> <style name="JK.SwipeBack.Transparent.Theme" parent="AppTheme"> <item name="android:windowBackground">@android:color/transparent</item> <item name="android:windowIsTranslucent">true</item> <item name="android:windowAnimationStyle">@style/JK.Animation.SlidingBack</item> <item name="android:actionBarStyle">@style/JKActionBar.Custom</item> </style> <style name="JKActionBar.Custom" parent="@style/Widget.AppCompat.Light.ActionBar.Solid.Inverse"> <item name="displayOptions">showCustom</item> <item name="android:background">@android:color/transparent</item> <item name="background">@android:color/transparent</item> <item name="android:displayOptions" tools:ignore="NewApi">showCustom</item> <item name="android:height">?actionBarSize</item> </style> <style name="JK.Animation.SlidingBack" parent="@android:style/Animation.Activity"> <item name="android:activityOpenEnterAnimation">@anim/slide_in_right</item> <item name="android:activityOpenExitAnimation">@anim/slide_out_right</item> <item name="android:activityCloseEnterAnimation">@anim/slide_in_right</item> <item name="android:activityCloseExitAnimation">@anim/slide_out_right</item> <item name="android:wallpaperOpenEnterAnimation">@anim/slide_in_right</item> <item name="android:wallpaperOpenExitAnimation">@anim/slide_out_right</item> <item name="android:wallpaperCloseEnterAnimation">@anim/slide_in_right</item> <item name="android:wallpaperCloseExitAnimation">@anim/slide_out_right</item> <item name="android:wallpaperIntraOpenEnterAnimation">@anim/slide_in_right</item> <item name="android:wallpaperIntraOpenExitAnimation">@anim/slide_out_right</item> <item name="android:wallpaperIntraCloseEnterAnimation">@anim/slide_in_right</item> <item name="android:wallpaperIntraCloseExitAnimation">@anim/slide_out_right</item> </style> </resources>
sliding_in_right.xml源码如下:
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:shareInterpolator="false" android:zAdjustment="top"> <translate android:duration="200" android:fromXDelta="100.0%p" android:toXDelta="0.0" /> </set>
sliding_out_right.xml源码如下:
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:shareInterpolator="false" android:zAdjustment="top"> <translate android:duration="200" android:fromXDelta="0.0" android:toXDelta="100.0%p" /> </set>
这样我们的手势滑动返回Activity就大功告成了,这里给出demo的下载地址github