android自定义控件实例

很多时候android常用的控件不能满足我们的需求,那么我们就需要自定义一个控件了。今天做了一个自定义控件的实例,来分享下。

              首先定义一个layout实现按钮内部布局:

01 <?xml version="1.0" encoding="utf-8"?>
02 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
03     android:layout_width="fill_parent"
04     android:layout_height="fill_parent"
05     android:orientation="horizontal" >
06  
07     <ImageView
08         android:id="@+id/imageView1"
09         android:layout_width="wrap_content"
10         android:layout_height="wrap_content"
11         android:layout_gravity="center_vertical"
12         android:paddingBottom="5dip"
13         android:paddingLeft="40dip"
14         android:paddingTop="5dip"
15         android:src="@drawable/right_icon" />
16  
17     <TextView
18         android:id="@+id/textView1"
19         android:layout_width="wrap_content"
20         android:layout_height="wrap_content"
21         android:layout_gravity="center_vertical"
22         android:layout_marginLeft="8dip"
23         android:text="确定"
24         android:textColor="#000000" />
25  
26 </LinearLayout>

        接下来写一个类继承LinearLayout,导入刚刚的布局,并且设置需要的方法,从而使的能在代码中控制这个自定义控件内容的显示。

01 public class ImageBtn extends LinearLayout {
02  
03     private ImageView imageView;
04     private TextView  textView;
05      
06     public ImageBtn(Context context) {
07         super(context);
08         // TODO Auto-generated constructor stub
09     }
10     public ImageBtn(Context context, AttributeSet attrs) {
11         super(context, attrs);
12         // TODO Auto-generated constructor stub
13         LayoutInflater inflater=(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
14         inflater.inflate(R.layout.imagebtn, this);
15         imageView=(ImageView) findViewById(R.id.imageView1);
16         textView=(TextView)findViewById(R.id.textView1);
17     }
18      
19     /**
20      * 设置图片资源
21      */ 
22     public void setImageResource(int resId) { 
23         imageView.setImageResource(resId); 
24     
25    
26     /**
27      * 设置显示的文字
28      */ 
29     public void setTextViewText(String text) { 
30         textView.setText(text); 
31     
32  
33 }

     在需要使用这个自定义控件的layout中加入这控件,只需要在xml中加入即可。

01 <?xml version="1.0" encoding="utf-8"?>
02 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
03     android:layout_width="fill_parent"
04     android:layout_height="fill_parent"
05     android:orientation="horizontal" >
06  
07     <cn.com.karl.view.ImageBtn
08         android:id="@+id/btn_right"
09         android:layout_height="wrap_content" 
10         android:layout_width="wrap_content"
11         android:background="@drawable/btn" 
12         />
13  
14     <cn.com.karl.view.ImageBtn
15         android:id="@+id/btn_error"
16         android:layout_marginLeft="5dp"
17         android:layout_height="wrap_content" 
18         android:layout_width="wrap_content"
19         android:background="@drawable/btn" 
20         />
21  
22 </LinearLayout>

        这里用到了背景图片 在drawable/btn.xml

1 <?xml version="1.0" encoding="utf-8"?>
2 <selector xmlns:android="http://schemas.android.com/apk/res/android" >
3  
4     <item android:state_focused="true" android:state_pressed="false" android:drawable="@drawable/btn_normal"></item>
5     <item android:state_pressed="true" android:drawable="@drawable/btn_white"></item>
6     <item android:state_checked="true" android:drawable="@drawable/btn_white"></item>
7     <item android:state_focused="false" android:state_pressed="false" android:drawable="@drawable/btn_normal"></item>
8      
9 </selector>

0_1324610237bs0z.gif.png 
最后在activity中设置该控件,和其他控件差不多:

01 public class IdentifyButtonActivity extends Activity {
02    private ImageBtn imageBtn1;
03    private ImageBtn imageBtn2;
04     @Override
05     protected void onCreate(Bundle savedInstanceState) {
06         // TODO Auto-generated method stub
07         super.onCreate(savedInstanceState);
08         setContentView(R.layout.identifybutton);
09          
10         imageBtn1=(ImageBtn) this.findViewById(R.id.btn_right);
11         imageBtn2=(ImageBtn) this.findViewById(R.id.btn_error);
12         imageBtn1.setTextViewText("确定");
13         imageBtn2.setTextViewText("取消");
14         imageBtn1.setImageResource(R.drawable.right_icon);
15         imageBtn2.setImageResource(R.drawable.error_icon);
16          
17         imageBtn1.setOnClickListener(new View.OnClickListener() {
18              
19             public void onClick(View v) {
20                 // TODO Auto-generated method stub
21                 Toast.makeText(getApplicationContext(), "点击的正确按钮", 1).show();
22             }
23         });
24          
25         imageBtn2.setOnClickListener(new View.OnClickListener() {
26              
27             public void onClick(View v) {
28                 // TODO Auto-generated method stub
29                 Toast.makeText(getApplicationContext(), "点击的错误按钮", 1).show();
30             }
31         });
32     }
33 }

        最后看看我们自定义控件的效果吧!
dddd.png
     点击后还有按下按钮的效果。

posted @ 2014-03-30 10:45  新感觉  阅读(282)  评论(0编辑  收藏  举报