各位好
小弟最近在写一个Gallery的例子,想实现的功能是在横屏上放置一个gallery,处于最中间的一幅图设置一个比较大的背景,左右两边的图都设置比较小的背景,整个gallery一直保持这样的格局。
gallery是顺便地实现了,但在动态地设置背景时,出现了问题,在我的OnItemSelectedListener中,为左右两边的图设置背景时,有时根据index竟然找不到....汗一个,请教各位大虾这是为什么呢?OnItemSelectedListener的代码如下:
gallery.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
Log.v("", "------------------------------------------------------");
Log.v("", "----- pic : " + arg2 + " is selected. Child count: " + arg0.getChildCount());
arg1.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_wallpaper_center));
View preView = arg0.getChildAt(arg2-1);
if(preView!=null){
preView.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_wallpaper_left));
Log.v("", "----- left pic : " + (arg2 - 1) + " 背景替换ok");
}
View nextView = arg0.getChildAt(arg2+1);
if(nextView!=null){
nextView.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_wallpaper_right));
Log.v("", "----- right pic : " + (arg2 + 1) + " 背景替换ok");
}
} @Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
请各位不吝赐教,先谢谢了。
小弟最近在写一个Gallery的例子,想实现的功能是在横屏上放置一个gallery,处于最中间的一幅图设置一个比较大的背景,左右两边的图都设置比较小的背景,整个gallery一直保持这样的格局。
gallery是顺便地实现了,但在动态地设置背景时,出现了问题,在我的OnItemSelectedListener中,为左右两边的图设置背景时,有时根据index竟然找不到....汗一个,请教各位大虾这是为什么呢?OnItemSelectedListener的代码如下:
gallery.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
Log.v("", "------------------------------------------------------");
Log.v("", "----- pic : " + arg2 + " is selected. Child count: " + arg0.getChildCount());
arg1.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_wallpaper_center));
View preView = arg0.getChildAt(arg2-1);
if(preView!=null){
preView.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_wallpaper_left));
Log.v("", "----- left pic : " + (arg2 - 1) + " 背景替换ok");
}
View nextView = arg0.getChildAt(arg2+1);
if(nextView!=null){
nextView.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_wallpaper_right));
Log.v("", "----- right pic : " + (arg2 + 1) + " 背景替换ok");
}
} @Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
请各位不吝赐教,先谢谢了。
我只是想获得当前被选中view的前一个/后一个view,用getChildAt不对吗?
package com.weektask01;import java.io.IOException;import android.app.Activity;
import android.app.WallpaperManager;
import android.content.Context;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.ContextMenu;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.view.ViewGroup.LayoutParams;
import android.webkit.MimeTypeMap;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;public class Wallpaper extends Activity {
private int curWallpaper;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.wallpaper); Gallery g = (Gallery) findViewById(R.id.gallery1);
// Set the adapter to our custom adapter (below)
g.setAdapter(new ImageAdapter(this));
g.setSpacing(0);
// g.setClickable(false);
// Set a item click listener, and just Toast the clicked position
// g.setOnItemClickListener(new OnItemClickListener() {
// public void onItemClick(AdapterView parent, View v, int position, long id) {
// Toast.makeText(Wallpaper.this, "" + position, Toast.LENGTH_SHORT).show();
// }
// });
g.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
curWallpaper = arg2;
TextView page = (TextView) findViewById(R.id.pageText);
page.setText((arg2 + 1) + "/" + arg0.getCount());
Log.v("", "");
Log.v("", "----- pic : " + arg2 + " is selected. " + arg0.getPositionForView(arg0.getSelectedView()));
arg1.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_wallpaper_center));
// View preView = arg0.focusSearch(arg1, AdapterView.FOCUS_LEFT);
View preView = arg0.getChildAt(arg2 - 1);
if(preView!=null){
preView.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_wallpaper_left));
Log.v("", "----- left pic 背景替换ok");
}
View nextView = arg0.getChildAt(arg2 + 1);
if(nextView!=null){
nextView.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_wallpaper_right));
Log.v("", "----- right pic 背景替换ok");
}
} @Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
// We also want to show context menu for longpressed items in the gallery
registerForContextMenu(g);
final WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);
Button setWallpaper = (Button) findViewById(R.id.application);
setWallpaper.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
try {
wallpaperManager.setResource(mImageIds[curWallpaper]);
finish();
} catch (IOException e) {
e.printStackTrace();
}
}
});
Button preview = (Button) findViewById(R.id.preview);
preview.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
} @Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
menu.add(R.string.app_name);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
Toast.makeText(this, "Longpress: " + info.position, Toast.LENGTH_SHORT).show();
return true;
}
// --------------------------- ImageAdapter ---------------------------
public class ImageAdapter extends BaseAdapter {
int mGalleryItemBackground;
private LayoutInflater mInflater;
private int curpos;
public ImageAdapter(Context c) {
mContext = c;
mInflater = LayoutInflater.from(mContext);
Log.v("ImageAdapter is defined!-----", mContext.toString());
curpos = 0;
// See res/values/attrs.xml for the <declare-styleable> that defines
// Gallery1.
// TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
// mGalleryItemBackground = a.getResourceId(
// R.styleable.Gallery1_android_galleryItemBackground, 0);
// a.recycle();
} public int getCount() {
return mImageIds.length;
} public Object getItem(int position) {
return position;
} public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.pic_center, null);
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.text);
holder.image = (ImageView) convertView.findViewById(R.id.pic);
holder.rootLayout = (LinearLayout) convertView.findViewById(R.id.rootLayout); convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.text.setText(myText[position]);
holder.image.setImageResource(mImageIds[position]);
Log.v("", "----- Pic at position: " + position + " is created!");
return convertView;
}
private class ViewHolder {
LinearLayout rootLayout;
ImageView image;
TextView text;
}
private Context mContext;
}
// image resources
private Integer[] mImageIds = {
R.drawable.wallpaper02,
R.drawable.wallpaper03,
R.drawable.wallpaper04,
R.drawable.wallpaper05,
R.drawable.wallpaper06,
R.drawable.wallpaper07,
R.drawable.wallpaper08,
R.drawable.wallpaper09,
R.drawable.wallpaper10,
R.drawable.wallpaper11
};
// text resources
private String[] myText = {
"Grass Road",
"Desert Road",
"Fishing Port",
"Black Wave",
"Red And Black",
"Waving",
"Universe",
"Drops On Grass",
"Purple Flowers",
"Wheet"
};
}
代码在此,gallery很平常的啊,和BaseAdapter配合使用,其中pic_center.xml文件如下:<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rootLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="vertical">
<ImageView
android:id="@+id/pic"
android:layout_height="100dip"
android:layout_width="100dip"
android:layout_gravity="center"
></ImageView>
<TextView
android:id="@+id/text"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text=""
></TextView>
</LinearLayout>