【发布时间】：2014-06-16 07:58:11
【问题描述】：
我创建了一个网格视图图像应用程序，我想在图像滑动中显示选定的图像。
实际上我在我的应用中实现了图像滑动但问题是图像滑动从第一张图像而不是从选定图像开始。
示例：
如果我选择第三张图片，图片滑动应该从第三张图片而不是第一张图片开始。
我的代码：
MainActivity.java
package com.td.gridview;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.ViewTreeObserver;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;
public class MainActivity extends Activity {
private GridView photoGrid;
private int mPhotoSize, mPhotoSpacing;
private ImageAdapter imageAdapter;
// Some items to add to the GRID
private static final String[] CONTENT = new String[]
{
"pic1",
"pic2",
"pic3",
"pic4",
"pic5",
"pic6",
"pic7",
"pic8",
"pic9"
};
static final int[] ICONS = new int[]
{
R.drawable.pic1,
R.drawable.pic2,
R.drawable.pic3,
R.drawable.pic4,
R.drawable.pic5,
R.drawable.pic6,
R.drawable.pic7,
R.drawable.pic8,
R.drawable.pic9
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// get the photo size and spacing
mPhotoSize = getResources().getDimensionPixelSize(R.dimen.photo_size);
mPhotoSpacing = getResources().getDimensionPixelSize(R.dimen.photo_spacing);
// initialize image adapter
imageAdapter = new ImageAdapter();
photoGrid = (GridView) findViewById(R.id.albumGrid);
//start sent image to full screen
/**
* On Click event for Single Gridview Item
* */
photoGrid.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v,
int position, long id) {
// Sending image id to FullScreenActivity
Intent i = new Intent(getApplicationContext(), SwipeActivity.class);
// passing array index
i.putExtra("id", position);
startActivity(i);
}
});
//end sent image to full screen
// set image adapter to the GridView
photoGrid.setAdapter(imageAdapter);
// get the view tree observer of the grid and set the height and numcols dynamically
photoGrid.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if (imageAdapter.getNumColumns() == 0) {
final int numColumns = (int) Math.floor(photoGrid.getWidth() / (mPhotoSize + mPhotoSpacing));
if (numColumns > 0) {
final int columnWidth = (photoGrid.getWidth() / numColumns) - mPhotoSpacing;
imageAdapter.setNumColumns(numColumns);
imageAdapter.setItemHeight(columnWidth);
}
}
}
});
}
// ///////// ImageAdapter class /////////////////
public class ImageAdapter extends BaseAdapter {
private LayoutInflater mInflater;
private int mItemHeight = 0;
private int mNumColumns = 0;
private RelativeLayout.LayoutParams mImageViewLayoutParams;
public ImageAdapter() {
mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mImageViewLayoutParams = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT);
}
public int getCount() {
return CONTENT.length;
}
// set numcols
public void setNumColumns(int numColumns) {
mNumColumns = numColumns;
}
public int getNumColumns() {
return mNumColumns;
}
// set photo item height
public void setItemHeight(int height) {
if (height == mItemHeight) {
return;
}
mItemHeight = height;
mImageViewLayoutParams = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, mItemHeight);
notifyDataSetChanged();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View view, ViewGroup parent) {
if (view == null)
view = mInflater.inflate(R.layout.photo_item, null);
ImageView cover = (ImageView) view.findViewById(R.id.cover);
TextView title = (TextView) view.findViewById(R.id.title);
cover.setLayoutParams(mImageViewLayoutParams);
// Check the height matches our calculated column width
if (cover.getLayoutParams().height != mItemHeight) {
cover.setLayoutParams(mImageViewLayoutParams);
}
cover.setImageResource(ICONS[position % ICONS.length]);
title.setText(CONTENT[position % CONTENT.length]);
return view;
}
}
}
SwipeActivity.java
package com.td.gridview;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import com.td.gridview.MainActivity;
public class SwipeActivity extends Activity
{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.swipe_view);
int[] icons = MainActivity.ICONS;
//get image position
Intent n = getIntent();
int position= n.getIntExtra("id", position);
ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager);
ImagePagerAdapter adapter = new ImagePagerAdapter(SwipeActivity.this , MainActivity.ICONS[position]);
viewPager.setAdapter(adapter);
viewPager.setCurrentItem(position);
}
private class ImagePagerAdapter extends PagerAdapter
{
int[] icons = MainActivity.ICONS;
@Override
public int getCount()
{
return icons.length;
}
@Override
public boolean isViewFromObject(View view, Object object)
{
return view == ((ImageView) object);
}
@Override
public Object instantiateItem(ViewGroup container, int position)
{
Context context = SwipeActivity.this;
ImageView imageView = new ImageView(context);
// int padding = context.getResources().getDimensionPixelSize(
// R.dimen.padding_large);
// imageView.setPadding(padding, padding, padding, padding);
imageView.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
imageView.setImageResource(icons[position]);
((ViewPager) container).addView(imageView, 0);
return imageView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object)
{
((ViewPager) container).removeView((ImageView) object);
}
}
}
【问题讨论】：
标签： android android-viewpager swipe photoswipe