android-我如何在全屏中滑动选定的网格图像
作者：互联网
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程序中实现了图片滑动,但是问题是图像滑动从第一张图片开始,而不是从所选图片开始.
例：
如果我选择第三张图片,则滑动图片应该从第三张图片开始,而不是从第一张图片开始.
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);
}
}
}
解决方法:
经过太多废话/错误之后,我终于得到了答案,这很简单…;)
// get intent data
Intent i = getIntent();
// Selected image id
int position = i.getExtras().getInt("id");
ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager);
ImagePagerAdapter adapter = new ImagePagerAdapter();
viewPager.setAdapter(adapter);
viewPager.setCurrentItem(position);
这是简单的答案,而不是以下代码：
ImagePagerAdapter adapter = new ImagePagerAdapter(mContext , icons[position]);
这工作.
viewPager.setCurrentItem(position);
现在下面是我的hole应用程序代码：
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[]
{
"Akon", "Justin Bieber", "AlRight", "Big Sean",
"Britney Spears", "Hilary", "Micheal Buble", "Akon", "Justin Bieber", "AlRight", "Big Sean",
"Britney Spears", "Hilary", "Micheal Buble", "Britney Spears", "Hilary", "Micheal Buble", "Akon",
"Justin Bieber", "AlRight", "Big Sean", "Britney Spears", "Hilary", "Micheal Buble", "Akon",
"Justin Bieber", "AlRight", "Big Sean", "Britney Spears", "Hilary", "Micheal Buble", "Akon",
"Justin Bieber", "AlRight", "Big Sean", "Britney Spears", "Hilary", "Micheal Buble", "Britney Spears",
"Hilary", "Micheal Buble", "Akon", "Justin Bieber", "AlRight", "Big Sean", "Britney Spears", "Hilary",
"Micheal Buble"
};
static final int[] ICONS = new int[]
{
R.drawable.cover_akon, R.drawable.cover_justin,
R.drawable.cover_alright, R.drawable.cover_big_sean, R.drawable.cover_britney, R.drawable.cover_hilary,
R.drawable.cover_mb, R.drawable.cover_akon, R.drawable.cover_justin, R.drawable.cover_alright,
R.drawable.cover_big_sean, R.drawable.cover_britney, R.drawable.cover_hilary, R.drawable.cover_mb,
R.drawable.cover_britney, R.drawable.cover_hilary, R.drawable.cover_mb, R.drawable.cover_akon,
R.drawable.cover_justin, R.drawable.cover_alright, R.drawable.cover_big_sean, R.drawable.cover_britney,
R.drawable.cover_hilary, R.drawable.cover_mb, R.drawable.cover_akon, R.drawable.cover_justin,
R.drawable.cover_alright, R.drawable.cover_big_sean, R.drawable.cover_britney, R.drawable.cover_hilary,
R.drawable.cover_mb, R.drawable.cover_akon, R.drawable.cover_justin, R.drawable.cover_alright,
R.drawable.cover_big_sean, R.drawable.cover_britney, R.drawable.cover_hilary, R.drawable.cover_mb,
R.drawable.cover_britney, R.drawable.cover_hilary, R.drawable.cover_mb, R.drawable.cover_akon,
R.drawable.cover_justin, R.drawable.cover_alright, R.drawable.cover_big_sean, R.drawable.cover_britney,
R.drawable.cover_hilary, R.drawable.cover_mb
};
@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;
public class SwipeActivity extends Activity
{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.swipe_view);
// get intent data
Intent i = getIntent();
// Selected image id
int position = i.getExtras().getInt("id");
ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager);
ImagePagerAdapter adapter = new ImagePagerAdapter();
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);
}
}
}
activity_main.xml中
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/albumGrid"
style="@style/PhotoGrid"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@color/black"
android:columnWidth="@dimen/photo_size"
android:horizontalSpacing="@dimen/photo_spacing"
android:numColumns="auto_fit"
android:padding="4dp"
android:scrollbars="none"
android:stretchMode="columnWidth"
android:verticalSpacing="@dimen/photo_spacing" />
photo_item.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/album_item"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ImageView
android:id="@+id/cover"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/cover"
android:background="#70000000"
android:padding="6dp" >
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="end"
android:singleLine="true"
android:textColor="@color/white"
android:textSize="12sp"
android:textStyle="bold" />
</LinearLayout>
</RelativeLayout>
swipe_view.xml
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/view_pager"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
标签：android,android-viewpager,swipe,photoswipe 来源： https://codeday.me/bug/20191013/1909942.html