gallery
1、GalleryTestActivity.java
package com.gallery.test;
import android.R.color;
import android.R.id;
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class GalleryTestActivity extends Activity implements OnClickListener {
private MyGallery gallery;
private Button pre, next;
private Context mCtx;
private int[] mImages = { R.drawable.photo1, R.drawable.photo2,
R.drawable.photo3, R.drawable.photo4, R.drawable.photo5,
R.drawable.photo6 };
int length = mImages.length;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mCtx = this;
gallery = (MyGallery) this.findViewById(R.id.gallery);
pre = (Button) this.findViewById(R.id.pre);
next = (Button) this.findViewById(R.id.next);
pre.setOnClickListener(this);
next.setOnClickListener(this);
gallery.setAdapter(new MyAdapter(mCtx, mImages));
gallery.setSelection(0);
setBackGrounds(0);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
int Id = v.getId();
int position = gallery.getSelectedItemPosition();
// gallery.getSelectedView().requestFocus();
switch (Id) {
case R.id.pre:
if (position > 0) {
gallery.onKeyDown(KeyEvent.KEYCODE_DPAD_LEFT, null);
setBackGrounds(position - 1);
} else {
Toast.makeText(mCtx, "已是第一张了", Toast.LENGTH_LONG).show();
}
break;
case R.id.next:
if (position < length - 1) {
gallery.onKeyDown(KeyEvent.KEYCODE_DPAD_RIGHT, null);
setBackGrounds(position + 1);
} else {
Toast.makeText(mCtx, "已是最后一张了", Toast.LENGTH_LONG).show();
}
break;
}
}
private void setBackGrounds(int position) {
// TODO Auto-generated method stub
if (position == 0) {
pre.setBackgroundColor(Color.DKGRAY);
next.setBackgroundResource(mImages[position + 1]);
} else if (position == length - 1) {
next.setBackgroundColor(Color.DKGRAY);
pre.setBackgroundResource(mImages[position - 1]);
} else {
pre.setBackgroundResource(mImages[position - 1]);
next.setBackgroundResource(mImages[position + 1]);
}
}
}
2、MyAdapter.java
package com.gallery.test;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
public class MyAdapter extends BaseAdapter {
private int mImages[];
private Context mCtx;
private ViewHolder vHolder;
public MyAdapter(Context context, int Images[]) {
mCtx = context;
mImages = Images;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return mImages.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ImageView i = (ImageView) convertView;
if (i == null) {
i = new ImageView(mCtx);
vHolder = new ViewHolder();
i.setTag(vHolder);
} else {
vHolder = (ViewHolder) i.getTag();
i = vHolder.imageView;
}
i.setImageResource(mImages[position]);
i.setPadding(40, 40, 40, 40);
return i;
}
public class ViewHolder {
public ImageView imageView;
}
}
3、MyGallery.java
package com.gallery.test;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.Gallery;
public class MyGallery extends Gallery {
public MyGallery(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
// TODO Auto-generated method stub
// return super.onFling(e1, e2, velocityX, velocityY);
return false;
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY) {
// TODO Auto-generated method stub
// return super.onScroll(e1, e2, distanceX, distanceY);
return false;
}
}
4、main.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<com.gallery.test.MyGallery
android:id="@+id/gallery"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</com.gallery.test.MyGallery>
<Button
android:id="@+id/pre"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_gravity="center_vertical|left"
android:background="@android:color/darker_gray"
android:text="上一张" />
<Button
android:id="@+id/next"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_gravity="center_vertical|right"
android:background="@android:color/darker_gray"
android:text="下一张" />
</FrameLayout>
另外:
去除阴影
android:fadingEdge=”none”
滚动,拖动时,无阴影覆盖
android:unselectedAlpha="1.0"