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android教程之教你用Gallery+ImageSwitcher实现相册功能(二)

Posted on by stone_xy

1、  接着上讲的内容,我们上次已经实现了用Gallery查看相册的缩略图,但是在该显示图片的地方我们却留白,现在就是用上这块空白区域的时候。

2、  首先添加一个ImageSwitcher控件,这个控件是用来实现在点击了某张图片的时候的显示。修改main.xml为

<?xml version=“1.0″ encoding=“utf-8″?>

<RelativeLayout xmlns:android=“apk/res/android”

android:orientation=“vertical”

android:layout_width=“fill_parent”

android:layout_height=“fill_parent”

>

<ImageSwitcher android:id=“@+id/switcher”

android:layout_width=“fill_parent”

android:layout_height=“260px”

android:layout_alignParentTop=“true”

android:layout_alignParentLeft=“true”

/>

<Gallery

android:id=“@+id/gallery”

android:layout_width=“fill_parent”

android:layout_height=“wrap_content”

android:spacing=“10dip”

android:layout_alignParentBottom=“true”

android:gravity=“center_vertical”

/>

</RelativeLayout>

 


3、  使MainActivity实现OnItemSelectedListener, ViewFactory接口,既

public class MainActivity extends Activity implements OnItemSelectedListener, ViewFactory {}

这时候编译器会提示MainActivity处有错,把鼠标移到那里,可以看到提示的改错方案,选择add implements methods,这样编译器会帮助我们生成onItemSelected,onNothingSelected和makeView 3个方法。

4、  在MainActivity中添加如下代码,具体的说明看注释

public class MainActivity extends Activity implements OnItemSelectedListener, ViewFactory {};

 

 

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {}

 

//ImageAdapter图片接口类   继承与BaseAdapter

public class ImageAdapter extends BaseAdapter{}

@Override  //getCount函数,用于返回图片的张数

public int getCount() {}

 

@Override  //getItem函数,用于返回图片的位置

public Object getItem(int position) {}

 

@Override

public long getItemId(int position) {}

 

@Override  //最主要的函数   返回一个ImageView的对象

public View getView(int position, View v, ViewGroup parent) {}

 

}

 

@Override

public void onItemSelected(AdapterView<?> arg0, View arg1, int position,

long arg3) {}

 

@Override

public void onNothingSelected(AdapterView<?> arg0) {}

 

@Override

public View makeView() {}

 

5、  效果

 

6、  这时候我们的基本功能就已经实现了,但是我们还可以做点优化,在我们查看相册的时候,我们是不是不用看到这个应用程序的标题?对了,我们把它隐藏掉吧。添加一句代码就行了。

requestWindowFeature(Window.FEATURE_NO_TITLE);//隐藏标题

这样目的基本达到,但是不是还想要全屏呢?这也有办法的啦,添加代码

int flag = WindowManager.LayoutParams.FLAG_FULLSCREEN;  //全屏Window myw = this.getWindow();myw.setFlags(flag, flag);

 

7、  我们再来看运行效果,是不是舒服多了呢?

源代码下载  地址2

One thought on “android教程之教你用Gallery+ImageSwitcher实现相册功能(二)

  1. 你那字体应该大一点,像这么长的文章就分几回来写,还有啊,那里面的图片弄些正常的,这几张估计只能吸引男的。

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