Lollipop中的Activity和fragment过渡是创建在Android中一个相对较新的功能之上的,在KitKat中引入的过渡框架为在应用程序中的不同UI状态之间设置动画提供了便捷的API,该框架围绕两个关键概念构建:场景和过渡。场景定义了应用程序UI的给定状态,而过渡则定义了两个场景之间的动画变化。
本示例将向您说明如何使用片段过渡创建自定义动画,以下是 res.layout/activity_main.xml 的内容,其中包含TextView
<?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/text" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_vertical|center_horizontal" android:text="@string/hello_world" android:textAppearance="?android:attr/textAppearanceMedium" />
以下是 res/animation/fragment_stack.xml 文件的内容。
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <fragment android:id="@+id/fragment1" android:name="com.pavan.listfragmentdemo.MyListFragment" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout>
以下是 res/animation/fragment_slide_left_enter.xml 文件的内容。
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <objectAnimator android:interpolator="@android:interpolator/decelerate_quint" android:valueFrom="100dp" android:valueTo="0dp" android:valueType="floatType" android:propertyName="translationX" android:duration="@android:integer/config_mediumAnimTime" /> <objectAnimator android:interpolator="@android:interpolator/decelerate_quint" android:valueFrom="0.0" android:valueTo="1.0" android:valueType="floatType" android:propertyName="alpha" android:duration="@android:integer/config_mediumAnimTime" /> </set>
以下是 res/animation/fragment_slide_left_exit.xml 文件的内容。
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <objectAnimator android:interpolator="@android:interpolator/decelerate_quint" android:valueFrom="0dp" android:valueTo="-100dp" android:valueType="floatType" android:propertyName="translationX" android:duration="@android:integer/config_mediumAnimTime" /> <objectAnimator android:interpolator="@android:interpolator/decelerate_quint" android:valueFrom="1.0" android:valueTo="0.0" android:valueType="floatType" android:propertyName="alpha" android:duration="@android:integer/config_mediumAnimTime" /> </set>
以下代码将是 res/animation/fragment_slide_right_enter.xml file的内容。
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <objectAnimator android:interpolator="@android:interpolator/decelerate_quint" android:valueFrom="-100dp" android:valueTo="0dp" android:valueType="floatType" android:propertyName="translationX" android:duration="@android:integer/config_mediumAnimTime" /> <objectAnimator android:interpolator="@android:interpolator/decelerate_quint" android:valueFrom="0.0" android:valueTo="1.0" android:valueType="floatType" android:propertyName="alpha" android:duration="@android:integer/config_mediumAnimTime" /> </set>
以下代码将是 res/animation/fragment_slide_right_exit.xml 文件的内容
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <objectAnimator android:interpolator="@android:interpolator/decelerate_quint" android:valueFrom="0dp" android:valueTo="100dp" android:valueType="floatType" android:propertyName="translationX" android:duration="@android:integer/config_mediumAnimTime" /> <objectAnimator android:interpolator="@android:interpolator/decelerate_quint" android:valueFrom="1.0" android:valueTo="0.0" android:valueType="floatType" android:propertyName="alpha" android:duration="@android:integer/config_mediumAnimTime" /> </set>
以下代码将是 src/main/java/MainActivity.java 文件的内容。它包含按钮侦听器,堆栈fragment和onCreateView
package com.example.fragmentcustomanimations; import android.app.Activity; import android.app.Fragment; import android.app.FragmentTransaction; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.Button; import android.widget.TextView; /** * Demonstrates the use of custom animations in a FragmentTransaction when * pushing and popping a stack. */ public class FragmentCustomAnimations extends Activity { int mStackLevel = 1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fragment_stack); //Watch for button clicks. Button button = (Button)findViewById(R.id.new_fragment); button.setOnClickListener(new OnClickListener() { public void onClick(View v) { addFragmentToStack(); } }); if (savedInstanceState == null) { //Do first time initialization -- add initial fragment. Fragment newFragment = CountingFragment.newInstance(mStackLevel); FragmentTransaction ft = getFragmentManager().beginTransaction(); ft.add(R.id.simple_fragment, newFragment).commit(); } else { mStackLevel = savedInstanceState.getInt("level"); } } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt("level", mStackLevel); } void addFragmentToStack() { mStackLevel++; //Instantiate a new fragment. Fragment newFragment = CountingFragment.newInstance(mStackLevel); //Add the fragment to the activity, pushing this transaction //on to the back stack. FragmentTransaction ft = getFragmentManager().beginTransaction(); ft.setCustomAnimations(R.animator.fragment_slide_left_enter, R.animator.fragment_slide_left_exit, R.animator.fragment_slide_right_enter, R.animator.fragment_slide_right_exit); ft.replace(R.id.simple_fragment, newFragment); ft.addToBackStack(null); ft.commit(); } public static class CountingFragment extends Fragment { int mNum; /** * Create a new instance of CountingFragment, providing "num" * as an argument. */ static CountingFragment newInstance(int num) { CountingFragment f = new CountingFragment(); //Supply num input as an argument. Bundle args = new Bundle(); args.putInt("num", num); f.setArguments(args); return f; } /** * When creating, retrieve this instance's number from its arguments. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mNum = getArguments() != null ? getArguments().getInt("num") : 1; } /** * The Fragment's UI is just a simple text view showing its * instance number. */ @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) { View v = inflater.inflate(R.layout.hello_world, container, false); View tv = v.findViewById(R.id.text); ((TextView)tv).setText("Fragment #" + mNum); tv.setBackgroundDrawable(getResources(). getDrawable(android.R.drawable.gallery_thumb)); return v; } } }
以下是 AndroidManifest.xml 的内容
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.fragmentcustomanimations" android:versionCode="1" android:versionName="1.0" > <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.example.fragmentcustomanimations.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> </application> </manifest>
让我们尝试运行我们刚刚创建的 Fragment Transitions 应用程序。我假设您在进行环境设置时创建了 AVD 。要从Android Studio运行该应用程序,请打开您项目的Activity文件之一,然后单击运行工具栏。 Android将应用程序安装在您的AVD上并启动它,如果您的设置和应用程序一切正常,它将显示在"Emulator"窗口以下:
如果单击新fragment,则将第一个fragment更改为第二个fragment,如下所示
链接:https://www.learnfk.comhttps://www.learnfk.com/android/android-fragment-transitions.html
来源:LearnFk无涯教程网
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