android TranslateAnimation类作动态菜单

最新推荐文章于 2016-12-21 00:19:52 发布

wapysun

最新推荐文章于 2016-12-21 00:19:52 发布

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文章标签：移动开发

本文介绍如何利用Android SDK中的TranslateAnimation类来创建视图平移动画，包括参数解读、代码示例及应用展示。

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要实现的效果如图：

代码很简单，主要是TranslateAnimation类的

publicTranslateAnimation(int fromXType, float fromXValue, int toXType, float toXValue, int fromYType, float fromYValue, int toYType, float toYValue)

Since:API Level 1

Constructor to use when building a TranslateAnimation from code

Parameters

fromXType	Specifies how fromXValue should be interpreted. One of Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or Animation.RELATIVE_TO_PARENT.
fromXValue	Change in X coordinate to apply at the start of the animation. This value can either be an absolute number if fromXType is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
toXType	Specifies how toXValue should be interpreted. One of Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or Animation.RELATIVE_TO_PARENT.
toXValue	Change in X coordinate to apply at the end of the animation. This value can either be an absolute number if toXType is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
fromYType	Specifies how fromYValue should be interpreted. One of Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or Animation.RELATIVE_TO_PARENT.
fromYValue	Change in Y coordinate to apply at the start of the animation. This value can either be an absolute number if fromYType is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise.
toYType	Specifies how toYValue should be interpreted. One of Animation.ABSOLUTE, Animation.RELATIVE_TO_SELF, or Animation.RELATIVE_TO_PARENT.
toYValue	Change in Y coordinate to apply at the end of the animation. This value can either be an absolute number if toYType is ABSOLUTE, or a percentage (where 1.0 is 100%) otherwise

代码如下：

package com.lenovo.wufl.translateanimationmenu; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.view.animation.Animation; import android.view.animation.TranslateAnimation; import android.widget.Button; import android.widget.LinearLayout; import android.widget.TextView; public class TranslateAnimationMenuActivity extends Activity implements OnClickListener { private TextView mMenu; private Button mButton; private TranslateAnimation mShowAnimation; private TranslateAnimation mHideAnimation; private boolean isShow; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); initView(); initAnimation(); } private void initView() { mMenu = (TextView) findViewById(R.id.menu); mButton = (Button) findViewById(R.id.button); mButton.setOnClickListener(this); mMenu.setVisibility(View.GONE); isShow = false; } private void initAnimation() { // 从自已-1倍的位置移到自己原来的位置 mShowAnimation = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, -1.0f, Animation.RELATIVE_TO_SELF, 0.0f); mHideAnimation = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, -1.0f); mShowAnimation.setDuration(500); mHideAnimation.setDuration(500); } @Override public void onClick(View v) { if (v.getId() == R.id.button) { if (isShow) { isShow = false; mMenu.startAnimation(mHideAnimation); mMenu.setVisibility(View.GONE); } else { isShow = true; mMenu.startAnimation(mShowAnimation); mMenu.setVisibility(View.VISIBLE); } } } }
布局：

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:id="@+id/menu" android:layout_width="fill_parent" android:layout_height="68dp" android:background="@android:color/darker_gray" android:gravity="center" android:text="I am a menu" android:textColor="@android:color/background_dark" /> <Button android:id="@+id/button" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:text="show/hide menu" /> </RelativeLayout>