gallery的简单使用方法

Gallery意思是"画廊",就是一个水平可左右拖动的列表,里面可以放置多个图片,经常和ImageSwitcher一起使用

在使用ImageSwitcher时,需要传入一个ViewFactory对象,并且需要给gallery设置数据适配器; 代码如下

public class MainActivity extends Activity {

    int[] images = new int[] { R.drawable.shuangzi, R.drawable.shuangyu,

            R.drawable.chunv, R.drawable.tiancheng, R.drawable.tianxie,

            R.drawable.sheshou, R.drawable.juxie, R.drawable.shuiping,

            R.drawable.shizi, R.drawable.baiyang, R.drawable.jinniu,

            R.drawable.mojie };

    private ImageSwitcher is;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.test1);

        is = (ImageSwitcher) findViewById(R.id.is);

        Gallery gallery = (Gallery) findViewById(R.id.gallery);

        is.setFactory(new ViewFactory() {

            @Override

            public View makeView() {

                ImageView iv = new ImageView(MainActivity.this);

                iv.setScaleType(ScaleType.FIT_XY);

                iv.setLayoutParams(new ImageSwitcher.LayoutParams(

                        LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

                return iv;

            }

        });

        gallery.setAdapter(new BaseAdapter() {

            @Override

            public View getView(int position, View convertView, ViewGroup parent) {

                ImageView iv = new ImageView(MainActivity.this);

                iv.setImageResource(images[position % images.length]);

                iv.setScaleType(ScaleType.FIT_XY);

                TypedArray ta = obtainStyledAttributes(R.styleable.Gallery);

                iv.setLayoutParams(new Gallery.LayoutParams(, ));

                iv.setBackgroundResource(ta.getResourceId(

                        R.styleable.Gallery_android_galleryItemBackground, ));

                return iv;

            }

            @Override

            public long getItemId(int position) {

                return position;

            }

            @Override

            public Object getItem(int position) {

                return images[position];

            }

            @Override

            public int getCount() {

                return images.length;

            }

        });

        gallery.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override

            public void onItemSelected(AdapterView<?> parent, View view,

                    int position, long id) {

                is.setImageResource(images[position%images.length]);

            }

            @Override

            public void onNothingSelected(AdapterView<?> parent) {

            }

        });

    }

}

上面getView方法作用是:显示画廊的水平列表
这里TypedArray作用是引入自定义控件的自定义属性

布局文件main.xml

<?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" >

    <ImageSwitcher

        android:id="@+id/is"

        android:layout_width="320dp"

        android:layout_height="320dp" >

    </ImageSwitcher>

    <Gallery

        android:id="@+id/gallery"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_marginTop="20dp"

        android:spacing="3dp"

        android:unselectedAlpha="0.5" />

</LinearLayout>

自定义属性attrs.xml文件位于values目录下

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <declare-styleable name="Gallery">

        <attr name="android:galleryItemBackground" />

    </declare-styleable>

</resources>

关于自定义属性参考文章:http://www.cnblogs.com/carlosk/archive/2012/06/06/2538336.html

http://blog.csdn.net/congqingbin/article/details/7869730

http://blog.csdn.net/tinafhx/article/details/5290878

巴特西

gallery的简单使用方法

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