Android之Gallery跟Spinner-Android学习之旅（二十九）

Spinner简介

spinner是竖直方向展开一个列表供选择。和gallery都是继承了AbsSpinner，AbsSpinner继承了AdapterView，因此AdaptyerView的属性都可以使用。

Spinner属性

实例

package peng.liu.testview;import android.app.Activity;import android.os.Bundle;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.BaseExpandableListAdapter;import android.widget.ExpandableListAdapter;import android.widget.ExpandableListView;import android.widget.GridView;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.SimpleAdapter;import android.widget.Spinner;import android.widget.TextView;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class MainActivity extends Activity {    private Spinner spinner02;    private String[] names = new String[]{            "java","python","html"    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        spinner02 = (Spinner) findViewById(R.id.spinner02);        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,names);        spinner02.setAdapter(adapter);    }}

布局代码

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:paddingBottom="@dimen/activity_vertical_margin"    tools:context=".MainActivity"    android:orientation="vertical">   <Spinner       android:layout_width="fill_parentw"       android:layout_height="wrap_content"       android:id="@+id/spinner01"       android:entries="@array/books"       android:prompt="@string/book"       />    <Spinner        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:id="@+id/spinner02"        android:prompt="@string/book"        /></LinearLayout>

Gallery简介

Gallery和Spinner都是AbsSpinner的子类，所以它和Spinner相似，但它是水平的展示，而且可以用手拖动查看。但是它在新版本已经不被推荐，代替是HorizontalScrollView和ViewPager。

Gallery属性

图片浏览器实例

package peng.liu.testview;import android.app.Activity;import android.content.res.TypedArray;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageView;public class MainActivity extends Activity {    private Gallery gallery;    private ImageView image;    private int[] names = new int[]{       R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher,R.drawable.ic_launcher    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        gallery = (Gallery) findViewById(R.id.gallery);        image = (ImageView) findViewById(R.id.image);        BaseAdapter adapter = new BaseAdapter() {            @Override            public int getCount() {                return names.length;            }            @Override            public Object getItem(int i) {                return null;            }            @Override            public long getItemId(int i) {                return 0;            }            @Override            public View getView(int i, View view, ViewGroup viewGroup) {                ImageView image = new ImageView(MainActivity.this);                image.setImageResource(names[i]);                image.setLayoutParams(new Gallery.LayoutParams(75,100));                image.setScaleType(ImageView.ScaleType.FIT_XY);                return image;            }        };        gallery.setAdapter(adapter);        gallery.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {            @Override            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {                image.setImageResource(names[i]);            }            @Override            public void onNothingSelected(AdapterView<?> adapterView) {            }        });    }}

布局代码

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:paddingBottom="@dimen/activity_vertical_margin"    tools:context=".MainActivity"    android:orientation="vertical">   <ImageView       android:layout_width="320dp"       android:layout_height="320dp"       android:id="@+id/image"       />    <Gallery        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_marginTop="25dp"        android:unselectedAlpha="0.6"        android:spacing="2pt"        android:id="@+id/gallery"/></LinearLayout>