Android基本界面控件四-图片控件

5.3 图片控件

5.3.1 ImageView

图5.3.1ImageView

android.widget.ImageView图片控件，继承自android.view.View，在android.widget包中。

最简单的使用方法。src设置图片路径，可引用drawable的图片。

动态声明ImageView，设置src。

5.3.2 ImageButton

图5.3.2ImageButton

android.widget.ImageButton图片控件，继承自android.widget.ImageView，在android.widget包中。

最简单的使用方法。src设置图片路径，可引用drawable的图片。

动态声明ImageView，设置src。

5.3.3 ImageSwitcher和Gallery

图5.3.3 ImageSwitcher

android.widget. ImageSwitcher图片控件，继承自android.widget.ViewSwitcher（ViewGroup）。在android.widget包中。

ImageSwithcer是用来图片显示那块区域的控件，使用方法setInAnimation(Animation)，setOutAnimation(Animation)设置动画。

Gallery是来控制底下那个图标索引列表索引用的。ImageAdapter继承自BaseAdapter，设置Gallery的适配器。

在layout添加ImageSwitcher和Gallery。定义 Activity，implements接口OnItemSelectedListener, ViewFactory。onCreate的时候定义要显示图片路径列表，设置Gallery的Adapter。onItemSelected事件触发 时，设置对应的图片。

Layout文件。

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<?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"> <ImageSwitcher android:id="@+id/switcher"   android:layout_width="fill_parent"    android:layout_height="fill_parent"   android:layout_alignParentTop="true"    android:layout_alignParentLeft="true" /> <Gallery android:id="@+id/gallery"  android:background="#55000000" android:layout_width="fill_parent"  android:layout_height="60dp" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true"  android:gravity="center_vertical" android:spacing="16dp" /> </RelativeLayout>

SwitcherActivity类。

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public class SwitcherActivity extends Activity implements OnItemSelectedListener, ViewFactory { private ImageSwitcher imageSwitcher;private Gallery gallery; private ArrayList<String> imageAssetPathList = new ArrayList<String>(); @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);super.setContentView(R.layout.switcher);this.imageSwitcher = (ImageSwitcher) findViewById(R.id.switcher);this.gallery = (Gallery) findViewById(R.id.gallery); for (int i = 1; i <= 20; i++) {this.imageAssetPathList.add("images/" + i + ".jpg");} this.imageSwitcher.setFactory(this);this.gallery.setAdapter(new ImageAdapter(this, this.imageAssetPathList));this.gallery.setOnItemSelectedListener(this); } @Overridepublic View makeView() {ImageView imageView = new ImageView(this);imageView.setBackgroundColor(0xFF000000);imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);imageView.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));return imageView;} @Overridepublic void onItemSelected(AdapterView<?> parent, View view, int position, long id) {try {InputStream inputStream = super.getAssets().open(this.imageAssetPathList.get(position));imageSwitcher.setImageDrawable(Drawable.createFromStream(inputStream, "" + position));} catch (IOException e) {e.printStackTrace();}} @Overridepublic void onNothingSelected(AdapterView<?> parent) { } }

ImageAdapter类

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public class ImageAdapter extends BaseAdapter { private Context content;private ArrayList<String> imageAssetPathList; public ImageAdapter(Context content, ArrayList<String> imageAssetPathList) {this.content = content;this.imageAssetPathList = imageAssetPathList;} @Overridepublic int getCount() {if (this.imageAssetPathList != null) {return this.imageAssetPathList.size();} else {return 0;}} @Overridepublic Object getItem(int position) {return null;} @Overridepublic long getItemId(int position) {return 0;} @Overridepublic View getView(int position, View convertView, ViewGroup parent) {try {ImageView imageView;imageView = new ImageView(this.content);imageView.setAdjustViewBounds(true);imageView.setScaleType(ImageView.ScaleType.FIT_XY);imageView.setPadding(0, 0, 0, 0); InputStream inputStream = this.content.getAssets().open(this.imageAssetPathList.get(position));imageView.setImageDrawable(Drawable.createFromStream(inputStream, "" + position)); return imageView;} catch (IOException e) {e.printStackTrace();return null;}} }

原文链接：http://limingnihao.javaeye.com/blog/851408

转载编辑： Fgamers

转载地址：http://disanji.net/2010/12/25/android-desktop-view-4-image/