Android基础TOP6_2:Gallery +Image完成画廊

Posted 2020-09-09

Activity：

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.example.top6_2.MainActivity" >
11 <Gallery 
12     android:id="@+id/gly"
13     android:layout_height="wrap_content"
14     android:layout_width="fill_parent"
15     android:animationDuration="1000"
16     android:spacing="20dp"
17     android:unselectedAlpha="0.5"
18      />
19    <ImageView 
20        android:id="@+id/img"
21        android:layout_height="wrap_content"
22        android:layout_width="wrap_content"
23        />
24 
25 </LinearLayout>

JAVA:

MinActivity:

 1 package com.example.top6_2;
 2 
 3 import android.R.integer;
 4 import android.app.Activity;
 5 import android.os.Bundle;
 6 import android.view.Menu;
 7 import android.view.MenuItem;
 8 import android.view.View;
 9 import android.widget.AdapterView;
10 import android.widget.AdapterView.OnItemClickListener;
11 import android.widget.AdapterView.OnItemSelectedListener;
12 import android.widget.Gallery;
13 import android.widget.ImageView;
14 
15 
16 public class MainActivity extends Activity {
17     private Gallery gal;
18     private ImageView iv;
19     private ImageAdapter adapter;  
20     private static final int[]  imgslds={
21             R.drawable.bjl,
22             R.drawable.dfhgc,
23             R.drawable.fg,
24             R.drawable.gj
25     };
26     @Override
27     protected void onCreate(Bundle savedInstanceState) {
28         super.onCreate(savedInstanceState);
29         setContentView(R.layout.activity_main);
30    iv=(ImageView) findViewById(R.id.img);
31    gal=(Gallery) findViewById(R.id.gly);
32    adapter=new ImageAdapter(this);
33    gal.setAdapter(adapter);
34     gal.setOnItemSelectedListener(gaILidstener);
35     }
36         private Gallery.OnItemSelectedListener gaILidstener=new Gallery.OnItemSelectedListener() {
37 
38         @Override
39         public void onItemSelected(AdapterView<?> parent, View view,
40                 int position, long id) {
41             // TODO Auto-generated method stub
42             iv.setImageResource(imgslds[position]);
43         }
44 
45         @Override
46         public void onNothingSelected(AdapterView<?> parent) {
47             // TODO Auto-generated method stub
48             
49         }
50     };
51     }

 ImagrAdapter:

 1 package com.example.top6_2;
 2 
 3 import android.R.integer;
 4 import android.content.Context;
 5 import android.view.Gravity;
 6 import android.view.View;
 7 import android.view.ViewGroup;
 8 import android.widget.BaseAdapter;
 9 import android.widget.Gallery;
10 import android.widget.ImageView;
11 
12 public class ImageAdapter extends BaseAdapter {
13     private Context context;
14     
15     private static final int[]  imgslds={
16         R.drawable.bjl,
17         R.drawable.dfhgc,
18         R.drawable.fg,
19         R.drawable.gj
20 };
21     public ImageAdapter(Context c){
22         context=c;
23         
24     }
25     public int getCount() {
26         // TODO Auto-generated method stub
27         //
28         return imgslds.length;
29         
30     }
31 
32     @Override
33     public Object getItem(int position) {
34         // TODO Auto-generated method stub
35         return position;
36     }
37 
38     @Override
39     public long getItemId(int position) {
40         // TODO Auto-generated method stub
41         return position;
42     }
43 
44     @Override
45     public View getView(int position, View convertView, ViewGroup parent) {
46         // TODO Auto-generated method stub
47         ImageView iv=new ImageView(context);
48         iv.setImageResource(imgslds[position]);
49         iv.setScaleType(ImageView.ScaleType.FIT_CENTER);
50         iv.setLayoutParams(new Gallery.LayoutParams(120,80));
51                     return iv; 
52     }
53 
54 }

效果图：