Android 控件之Gallery图片集
openkk
13年前
Gallery是Android中的图片库控件。先看效果，爽一番
一、简介
在中心锁定，水平显示列表的项。
二、实例
1.布局文件
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:orientation="vertical" android:layout_height="wrap_content"> <Gallery xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/gallery" android:layout_width="match_parent" android:layout_height="wrap_content" /> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="wrap_content"> <Gallery android:id="@+id/gallery1" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_vertical" android:spacing="16dp" /> </LinearLayout> </LinearLayout>
2.属性文件
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="TogglePrefAttrs"> <attr name="android:preferenceLayoutChild" /> </declare-styleable> <!-- These are the attributes that we want to retrieve from the theme in view/Gallery1.java --> <declare-styleable name="Gallery1"> <attr name="android:galleryItemBackground" /> </declare-styleable> <declare-styleable name="LabelView"> <attr name="text" format="string" /> <attr name="textColor" format="color" /> <attr name="textSize" format="dimension" /> </declare-styleable> </resources>
3.代码
/** * */ package wjq.WidgetDemo; import android.R.layout; import android.app.Activity; import android.content.Context; import android.content.res.TypedArray; import android.database.Cursor; import android.os.Bundle; import android.provider.Contacts.People; import android.view.ContextMenu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.view.ContextMenu.ContextMenuInfo; import android.widget.BaseAdapter; import android.widget.Gallery; import android.widget.ImageView; import android.widget.SimpleCursorAdapter; import android.widget.SpinnerAdapter; import android.widget.Toast; import android.widget.AdapterView.AdapterContextMenuInfo; /** * @author 记忆的永恒 * */ public class GalleryDemo extends Activity { private Gallery gallery; private Gallery gallery1; /* * (non-Javadoc) * * @see android.app.Activity#onCreate(android.os.Bundle) */ @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.gallerypage); gallery = (Gallery) findViewById(R.id.gallery); gallery.setAdapter(new ImageAdapter(this)); registerForContextMenu(gallery); Cursor c = getContentResolver().query(People.CONTENT_URI, null, null, null, null); startManagingCursor(c); SpinnerAdapter adapter = new SimpleCursorAdapter(this, // Use a template that displays a text view android.R.layout.simple_gallery_item, // Give the cursor to the list adatper c, // Map the NAME column in the people database to... new String[] {People.NAME}, // The "text1" view defined in the XML template new int[] { android.R.id.text1 }); gallery1= (Gallery) findViewById(R.id.gallery1); gallery1.setAdapter(adapter); } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { menu.add("Action"); } @Override public boolean onContextItemSelected(MenuItem item) { AdapterContextMenuInfo info = (AdapterContextMenuInfo) item .getMenuInfo(); Toast.makeText(this, "Longpress: " + info.position, Toast.LENGTH_SHORT) .show(); return true; } public class ImageAdapter extends BaseAdapter { int mGalleryItemBackground; private Context mContext; private Integer[] mImageIds = { R.drawable.b, R.drawable.c, R.drawable.d, R.drawable.f, R.drawable.g }; public ImageAdapter(Context context) { mContext = context; TypedArray a = obtainStyledAttributes(R.styleable.Gallery1); mGalleryItemBackground = a.getResourceId( R.styleable.Gallery1_android_galleryItemBackground, 0); a.recycle(); } @Override public int getCount() { return mImageIds.length; } @Override public Object getItem(int position) { return position; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { ImageView i = new ImageView(mContext); i.setImageResource(mImageIds[position]); i.setScaleType(ImageView.ScaleType.FIT_XY); i.setLayoutParams(new Gallery.LayoutParams(300, 400)); // The preferred Gallery item background i.setBackgroundResource(mGalleryItemBackground); return i; } } }