Android38_ImageView和Gallery
一、ImageView使用方法
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" ><Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="测试"/><ImageView android:id="@+id/image" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:src="@drawable/image"/></LinearLayout>
?ImageViewActivity.java
package com.android.activity;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.view.animation.AlphaAnimation;import android.view.animation.Animation;import android.view.animation.AnimationSet;import android.view.animation.RotateAnimation;import android.widget.Button;import android.widget.ImageView;public class ImageViewActivity extends Activity {private Button button = null;private ImageView image = null;@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); button = (Button)findViewById(R.id.button); image = (ImageView)findViewById(R.id.image); button.setOnClickListener(new ButtonListener()); }class ButtonListener implements OnClickListener{public void onClick(View v) {AnimationSet animationSet = new AnimationSet(true);//淡入淡出AlphaAnimation alphaAnimation = new AlphaAnimation(1, 0);alphaAnimation.setDuration(1000);//旋转RotateAnimation rotateAnimation = new RotateAnimation(0, 360,Animation.RELATIVE_TO_SELF,0.5f,Animation.RELATIVE_TO_SELF,0.5f);rotateAnimation.setDuration(1000);animationSet.addAnimation(alphaAnimation);animationSet.addAnimation(rotateAnimation);image.startAnimation(animationSet);}}}?运行结果：既旋转有淡出
?
<Gallery android:id="@+id/gallery" android:layout_width="fill_parent" android:layout_height="wrap_content" android:animationDuration="100" android:unselectedAlpha="0.5" android:spacing="2dp" android:gravity="center_vertical"> </Gallery>?
package com.android.activity;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{// 定义Contextprivate Context context;// 定义整型数组 即图片源private Integer[] images = {R.drawable.img7, R.drawable.img8, R.drawable.img9, R.drawable.img10, R.drawable.img11, R.drawable.img12, };// 声明 ImageAdapterpublic ImageAdapter(Context c){context = c;}// 获取图片的个数public int getCount(){return images.length;}// 获取图片在库中的位置public Object getItem(int position){return position;}// 获取图片IDpublic long getItemId(int position){return position;}/** * 可以设置多种效果 */public View getView(int position, View convertView, ViewGroup parent){ImageView imageview = new ImageView(context);// 给ImageView设置资源imageview.setImageResource(images[position]);// 设置布局 图片120×120显示imageview.setLayoutParams(new Gallery.LayoutParams(192, 120));// 设置显示比例类型imageview.setScaleType(ImageView.ScaleType.FIT_CENTER);return imageview;}}?
??????? 3.得到Gallery对象，设置Adapter，以及监听器。
?package com.android.activity;
import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.Gallery;import android.widget.Toast;public class GalleryActivity extends Activity {Gallery gallery = null;@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //获得Gallery对象 gallery = (Gallery) findViewById(R.id.gallery); //添加ImageAdapter给Gallery对象 gallery.setAdapter(new ImageAdapter(this)); //添加监听器 gallery.setOnItemClickListener(new ImageItemClickListener()); }class ImageItemClickListener implements OnItemClickListener{public void onItemClick(AdapterView<?> parent, View v, int position, long id) { System.out.println("选择了"+(position+1)+"张图片"); }}}?运行结果：
?