学习笔记-Android(安卓)Gallery实现
16lz
2021-12-04
Android使用Gallery实现图片的滚动效果。在实现时,需要先重写adapter,用于存放图片和设置图片显示大小和比例。
ImageAdapter:
package com.helen;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
public class ImageAdapter extends BaseAdapter {
private Context ctx;
/*定义图片源*/
private int[] imgIds ={
R.drawable.h001,
R.drawable.h002,
R.drawable.h003,
R.drawable.h004
};
public ImageAdapter(Context ctx)
{
this.ctx = ctx;
}
/**
* 获取图片的个数
*/
@Override
public int getCount() {
// TODO Auto-generated method stub
return imgIds.length;
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
ImageView iv = new ImageView(ctx);
iv.setImageResource(imgIds[arg0]);
//设置图片的显示大小
iv.setLayoutParams(new Gallery.LayoutParams(120,120));
//设置图片的显示比例,fit_center将拉伸图片,center不拉伸
iv.setScaleType(ImageView.ScaleType.CENTER);
return iv;
}
}
Activity中获取Gallery对象,设置adapter,即可实现效果,如果需要设置鼠标点击图片的事件,设置相应的事件监听即可,包括onItemClickListener,OnItemSelectedListner,OnItemLongClickListener等。
Gallery gl = (Gallery)findViewById(R.id.gl);
//添加imgAdp
gl.setAdapter(new ImageAdapter(this));
//事件监听
gl.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
}});
实现效果:
ImageAdapter:
package com.helen;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
public class ImageAdapter extends BaseAdapter {
private Context ctx;
/*定义图片源*/
private int[] imgIds ={
R.drawable.h001,
R.drawable.h002,
R.drawable.h003,
R.drawable.h004
};
public ImageAdapter(Context ctx)
{
this.ctx = ctx;
}
/**
* 获取图片的个数
*/
@Override
public int getCount() {
// TODO Auto-generated method stub
return imgIds.length;
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
ImageView iv = new ImageView(ctx);
iv.setImageResource(imgIds[arg0]);
//设置图片的显示大小
iv.setLayoutParams(new Gallery.LayoutParams(120,120));
//设置图片的显示比例,fit_center将拉伸图片,center不拉伸
iv.setScaleType(ImageView.ScaleType.CENTER);
return iv;
}
}
Activity中获取Gallery对象,设置adapter,即可实现效果,如果需要设置鼠标点击图片的事件,设置相应的事件监听即可,包括onItemClickListener,OnItemSelectedListner,OnItemLongClickListener等。
Gallery gl = (Gallery)findViewById(R.id.gl);
//添加imgAdp
gl.setAdapter(new ImageAdapter(this));
//事件监听
gl.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// TODO Auto-generated method stub
}});
实现效果:
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