控件:Gallery --- 1.(自定义适配器)
发现setAdapter()设置的时候可以使用的子类:ArrayAdapter、SimpleAdapter、BaseAdapter。
1.BaseAdapter实际上是一个用户自己去实现的操作,包括定义显示的组件等等。
main.xml
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/MyLayout"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Gallery
android:id="@+id/myGallery"
android:gravity="center_vertical"
android:spacing="3px"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
ImageGalleryAdapter.java
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import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.LinearLayout.LayoutParams;
public class ImageGalleryAdapter extends BaseAdapter {
// Context对象
private Context myContext;
private int imgRes[] = new int[] {
R.drawable.ispic_a, R.drawable.ispic_b,
R.drawable.ispic_c, R.drawable.ispic_d,
R.drawable.ispic_e };
// 接收Context
public ImageGalleryAdapter(Context c) {
this.myContext = c;
}
@Override
public int getCount() { // 返回图片个数
return this.imgRes.length;
}
@Override
public Object getItem(int position) { // 取得指定位置的图片
return this.imgRes[position];
}
@Override
public long getItemId(int position) { // 取得指定位置的图片
return this.imgRes[position];
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView img = new ImageView(this.myContext);
img.setBackgroundColor(0xFFFFFFFF);
// 给ImageView设置资源
img.setImageResource(this.imgRes[position]);
// 居中显示
img.setScaleType(ImageView.ScaleType.CENTER);
// 布局参数
img.setLayoutParams(new Gallery.LayoutParams(
LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
return img;
}
}
MyGalleryDemo.java
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import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Gallery;
import android.widget.Toast;
public class MyGalleryDemo extends Activity {
// 图片浏览
private Gallery gallery = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 调用布局文件
super.setContentView(R.layout.main);
// 取得组件
this.gallery = (Gallery) super.findViewById(R.id.myGallery) ;
// 设置图片集
this.gallery.setAdapter(new ImageGalleryAdapter(this));
// 设置单击事件
this.gallery.setOnItemClickListener(new OnItemClickListenerImpl()) ;
}
private class OnItemClickListenerImpl implements OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
// 显示图片编号
Toast.makeText(MyGalleryDemo.this,
"" + position, Toast.LENGTH_SHORT).show();
}
}
}
AndroidManifest.xml
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.lxh.demo"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="3" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".MyGalleryDemo"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>