Spinner控件的使用以及动画的使用_spinner 动画-优快云博客

本文链接：https://blog.youkuaiyun.com/xinke87/article/details/6328378

这篇博客详细介绍了如何在Android中使用Spinner控件，包括设置Spinner的布局、加载数据以及自定义下拉菜单视图。同时，还展示了如何为Spinner添加动画效果，如透明度变化和位置平移，通过AnimationUtils加载并应用XML动画文件。通过SpinnerActivity.java的代码示例，阐述了监听Spinner选择事件以及触摸事件来触发动画的方法。

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main.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/textView" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <Spinner android:id="@+id/spinner" android:layout_width="fill_parent" android:layout_height="wrap_content" > </Spinner> </LinearLayout>

animation.xml

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:fromXDelta="0" android:toXDelta="50%p" android:duration="300"> </translate> <alpha android:fromAlpha="0.6" android:toAlpha="1.0" android:duration="300"> </alpha> </set>

动画的显示：

动画有四种类型显示：alpha（透明度），scale（缩放），translate（位置），rotate（旋转）。

spinnerdropdown.xml

<?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/text1" android:layout_width="fill_parent" android:layout_height="wrap_content" > </TextView>

adapter.setDropDownViewResource(R.layout.spinnerdropdown);

针对下拉菜单中的Textiew进行设置。

SpinnerActivity.java

package com.itxinke.www; import android.app.Activity; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.view.animation.Animation; import android.view.animation.AnimationUtils; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.TextView; public class SpinnerActivity extends Activity { /** Called when the activity is first created. */ private static final String[] location = { "北京","天津","上海","深圳" }; private Spinner spinner; private TextView textView; private ArrayAdapter<String> adapter; Animation animation; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); textView = (TextView)findViewById(R.id.textView); spinner = (Spinner)findViewById(R.id.spinner); adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item,location); adapter.setDropDownViewResource(R.layout.spinnerdropdown); spinner.setAdapter(adapter); spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub textView.setText(location[arg2]); arg0.setVisibility(View.VISIBLE); } @Override public void onNothingSelected(AdapterView<?> arg0) { // TODO Auto-generated method stub } }); animation = AnimationUtils.loadAnimation(this, R.layout.animation); spinner.setOnTouchListener(new Spinner.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub v.startAnimation(animation); return false; } }); } }