可能重复：
如何在 android 的图库中设置三乘三图像？
我是安卓新手。我必须在我的应用程序中添加画廊。这个画廊使用数组列表从可绘制文件夹中获取图像并且有两个按钮“下一个”和“上一个”。现在我的问题是首先从可绘制文件夹的数组列表中显示三个图像，然后当我按下下一个按钮时，再显示另外三个图像，依此类推。同样在上一个按钮上。这在纵向和横向模式下显示相同。
请帮忙....？
谢谢..
这是我的代码请帮助我....
package com.chirag.AppGallery;
import android.R.color;
import android.app.Activity;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.view.ViewGroup.MarginLayoutParams;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.Gallery.LayoutParams;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
public class ViewAppGalleryActivity extends Activity {
// take an array of integer type and set its value
Integer[] mImageIds = {
R.drawable.gallery_photo_19,
R.drawable.gallery_photo_20,
R.drawable.gallery_photo_21,
R.drawable.gallery_photo_22,
R.drawable.gallery_photo_23,
R.drawable.gallery_photo_24
R.drawable.gallery_photo_25,
R.drawable.gallery_photo_15,
R.drawable.gallery_photo_16,
R.drawable.gallery_photo_18,
R.drawable.gallery_photo_9,
R.drawable.gallery_photo_10,
R.drawable.gallery_photo_11,
R.drawable.gallery_photo_12,
R.drawable.gallery_photo_26,
R.drawable.gallery_photo_27,
R.drawable.gallery_photo_28,
R.drawable.gallery_photo_29,
R.drawable.gallery_photo_30
};
private int imageWidth;
private ImageView leftArrowImageView;
private int selectedImagePosition = 0;
private ImageView rightArrowImageView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// take an instance of Gallery
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
final ExtendedGallery g = (ExtendedGallery)findViewById(R.id.gallery);
// g.setScrollingEnabled(false);
MarginLayoutParams mlp = (MarginLayoutParams)g.getLayoutParams();
mlp.setMargins(-(metrics.widthPixels/2 +60 ), mlp.topMargin,
mlp.rightMargin, mlp.bottomMargin);
// set adapter to gallery calling ImageAdapter class
g.setAdapter(new ImageAdapter(this, mImageIds));
g.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
ImageView imgView=(ImageView)findViewById(R.id.imageView1);
imgView.setImageResource(mImageIds [position]);
if (selectedImagePosition > 0 && selectedImagePosition <mImageIds.length - 3)
{
leftArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable. arrow_left_enabled));
rightArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable. arrow_right_enabled));
}
else if (selectedImagePosition == 0) {
leftArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable. arrow_left_disabled));
rightArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable. arrow_right_enabled));
}
else if (selectedImagePosition == mImageIds.length - 3 || selectedImagePosition == mImageIds. length - 2 || selectedImagePosition == mImageIds.length - 1)
{
leftArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable. arrow_left_enabled));
rightArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable. arrow_right_disabled));
}
}
});
g.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
selectedImagePosition = pos;
if (selectedImagePosition > 0 && selectedImagePosition <mImageIds.length - 3)
{
leftArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable. arrow_left_enabled));
rightArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable. arrow_right_enabled));
}
else if (selectedImagePosition == 0)
{
leftArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable. arrow_left_disabled));
rightArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable. arrow_right_enabled));
}
else if
(selectedImagePosition == mImageIds.length - 3 || selectedImagePosition == mImageIds. length - 2 || selectedImagePosition == mImageIds.length - 1 )
{
//leftArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_left_enabled));
rightArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable. arrow_right_disabled));
}
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
leftArrowImageView = (ImageView) findViewById(R.id.left_arrow_imageview);
rightArrowImageView = (ImageView) findViewById(R.id.right_arrow_imageview);
leftArrowImageView.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
if (selectedImagePosition > 2) {
--selectedImagePosition;
--selectedImagePosition;
--selectedImagePosition;
}else if(selectedImagePosition == 2)
{
--selectedImagePosition;
--selectedImagePosition;
}else if(selectedImagePosition == 1)
{
--selectedImagePosition;
}
g.setSelection(selectedImagePosition, false);
//g.scrollBy(20, 0);
//leftArrowImageView.setImageDrawable(getResources().getDrawable(R.drawable.arrow_left_disabled));
}
});
rightArrowImageView.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
if (selectedImagePosition < mImageIds.length-3 ) {
++selectedImagePosition;
++selectedImagePosition;
++selectedImagePosition;
}
g.setSelection(selectedImagePosition, false);
}
});
}
public class ImageAdapter extends BaseAdapter{
// Take variable of type Context and String Array because we
// get the context and array from called class
Context c;
Integer[] ImageIds;
// Take INT variable for saving background id
int mGalleryItemBackground;
public ImageAdapter(Context c ,Integer[] imageIds){
// pass the value to local variable of this class
this.c = c;
this.ImageIds = imageIds;
// get an instance of TypedArray and Retrieve styled attribute
// information in this Context's theme
TypedArray a = c.obtainStyledAttributes(R.styleable.GalleryExample);
// get ResourceId from attr and set it to mGalleryItemBackground
mGalleryItemBackground = a.getResourceId(
R.styleable.GalleryExample_android_galleryItemBackground, 0);
//Give back a previously retrieved StyledAttributes, for later re-use.
a.recycle();
}
public int getCount() {
// TODO Auto-generated method stub
// This will return the length of array
return ImageIds.length;
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
// Take an ImageView of Context c
ImageView mImageSelected = new ImageView(c);
// set ImageView Property
/* if (position >= mImageIds.length)
{
position = position % mImageIds.length;
}
*/
mImageSelected.setImageResource(ImageIds[position]);
//mImageSelected.setBackgroundResource(mGalleryItemBackground);
mImageSelected.setScaleType(ImageView.ScaleType.FIT_XY);
//mImageSelected.setLayoutParams(new Gallery.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
mImageSelected.setLayoutParams(new Gallery.LayoutParams(200,170));
// return ImageView
return mImageSelected;
}
}
}
这是我的 xml 文件
<?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"
android:orientation="vertical"
android:background="#ffffff" >
<RelativeLayout
android:id="@+id/relativeLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
>
<RelativeLayout
android:id="@+id/relativeLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_toLeftOf="@+id/gallery" >
<ImageView
android:id="@+id/left_arrow_imageview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/relativeLayout1"
android:layout_marginTop="50dp"
android:src="@drawable/arrow_left_disabled" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/relativeLayout2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/gallery"
android:layout_marginLeft="30dp"
android:layout_marginRight="10dp"
android:layout_marginTop="50dp"
android:layout_toLeftOf="@+id/relativeLayout1" >
<com.chirag.AppGallery.ExtendedGallery
android:id="@+id/gallery"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:spacing="10px" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/relativeLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_toRightOf="@+id/gallery" >
<ImageView
android:id="@+id/right_arrow_imageview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/relativeLayout1"
android:layout_marginTop="50dp"
android:src="@drawable/arrow_right_enabled" />
</RelativeLayout>
</RelativeLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/relativeLayout1"
android:layout_marginTop="14dp" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_marginBottom="15dp"
android:layout_marginTop="10dp"
android:src="@drawable/gallery_photo_19" />
</RelativeLayout>
</RelativeLayout>
