(4.1.9)gallery

来源：互联网发布：tcpip网络层协议有哪些编辑：程序博客网时间：2024/06/07 20:47

运行效果如下：

选择一张好看的后，效果如下

activity_main.xml 代码：

[html] view plaincopy
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent" >  
    <ImageButton   
        android:id="@+id/myimagebutton"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:src="@drawable/ic_launcher"  
        />  
    <EditText   
        android:layout_width="200dp"  
        android:layout_height="wrap_content"  
        />  
</LinearLayout>  

弹框的View布局文件代码为：

[html] view plaincopy
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"   
    android:orientation="vertical"  
    >  
    <Gallery  
        android:id="@+id/mygallery"  
        android:layout_width="220dp"  
        android:layout_height="60dp"  
        android:spacing="10dp" />  
</LinearLayout>  

Gallery的item布局文件为：

[html] view plaincopy
<LinearLayout  
    xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    android:orientation="vertical">  
    <ImageView   
        android:id="@+id/image"  
        android:layout_gravity="center_horizontal"  
        android:layout_width="40dp"  
        android:layout_height="40dp"/>  
    <TextView   
        android:id="@+id/text"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_gravity="center_horizontal"  
        android:textSize="8dp"  
        android:gravity="center"  
        android:textColor="#ffffffff"/>  
</LinearLayout>  

Activity代码为：

[java] view plaincopy
public class MainActivity extends Activity implements OnItemSelectedListener{  
      
    Gallery gallery;  
    int [] smalldrawable = new int[]{R.drawable.sample_thumb_0,R.drawable.sample_thumb_1,R.drawable.sample_thumb_2,R.drawable.sample_thumb_3,R.drawable.sample_thumb_4,R.drawable.sample_thumb_5,R.drawable.sample_thumb_6,R.drawable.sample_thumb_7};  
      
    int position = 0;  
    ImageButton imageButton;  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
          
          
        AlertDialog.Builder builder = new AlertDialog.Builder(this);  
        LayoutInflater layoutInflater = LayoutInflater.from(this);  
        final View view = layoutInflater.inflate(R.layout.mydialog, null);  
        builder.setTitle("请选择一张好看的");  
        builder.setView(view);  
          
          
        gallery = (Gallery) view.findViewById(R.id.mygallery);  //此处的findViewById必须要加上view.  
        gallery.setAdapter(new ImageAdapter(this));  
        gallery.setSelection(0);  
        gallery.setOnItemSelectedListener(this);  
          
          
        imageButton = (ImageButton) findViewById(R.id.myimagebutton);  
          
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {  
            @Override  
            public void onClick(DialogInterface dialog, int which) {  
                System.out.println(position);  
                imageButton.setImageResource(smalldrawable[position]);  
            }  
        });  
          
        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {  
            @Override  
            public void onClick(DialogInterface dialog, int which) {  
            }  
        });       
        builder.create().show();  
          
          
    }  
  
    private class ImageAdapter extends BaseAdapter{  
        Context context;  
          
        String [] str = new String[]{"第一张","第二张","第三张","第四张","第五张","第六张","第七张","第八张"};  
        public ImageAdapter(Context context) {  
            this.context = context;  
        }  
          
        //返回图片的个数  
        @Override  
        public int getCount() {  
            return smalldrawable.length;  
        }  
  
        @Override  
        public Object getItem(int position) {  
            return smalldrawable[position];  
        }  
  
        @Override  
        public long getItemId(int position) {  
            return position;  
        }  
  
        @Override  
        public View getView(int position, View convertView, ViewGroup parent) {  
            ViewHolder holder;  
            if(convertView == null){  
                //View的findViewById()方法也是比较耗时的，因此需要考虑中调用一次，之后用  
                //View的getTag()来获取这个ViewHolder对象  
                holder = new ViewHolder();  
                convertView = View.inflate(context, R.layout.mydialogtype, null);  
                holder.imageView = (ImageView) convertView.findViewById(R.id.image);  
                holder.textView = (TextView) convertView.findViewById(R.id.text);  
                convertView.setTag(holder);  
            }else {  
                holder = (ViewHolder) convertView.getTag();  
            }  
            holder.imageView.setImageResource(smalldrawable[position]);  
            holder.textView.setText(str[position]);  
              
            return convertView;  
        }  
    }  
      
    //增加这样一个静态类，缓存一下，这样不用每次都重新加载  
    final class ViewHolder{  
        public ImageView imageView;  
        public TextView textView;  
    }  
    @Override  
    public void onItemSelected(AdapterView<?> parent, View view, int position,  
            long id) {  
        int x = 0;  
        System.out.println(position);  
        this.position = position;  
    }  
  
    @Override  
    public void onNothingSelected(AdapterView<?> parent) {  
    }  
}  

ok，就这些了。

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