public void onClick(View v) {
			EditText fld=(EditText)findViewById(R.id.name);
			String name=fld.getText().toString();
			
			fld=(EditText)findViewById(R.id.phone);
			
			String phone=fld.getText().toString();
			Intent i=new Intent(Intent.ACTION_INSERT_OR_EDIT);
			
			i.setType(Contacts.CONTENT_ITEM_TYPE);
			i.putExtra(Insert.NAME, name);
			i.putExtra(Insert.PHONE, phone);
			startActivity(i);
		}

 加入包名：

import android.provider.ContactsContract.Contacts;
import android.provider.ContactsContract.Intents.Insert;

2.判断不同的版本

static {
		int sdk=new Integer(Build.VERSION.SDK).intValue();
		
		if (sdk>=5) {
			try {
				Class clazz=Class.forName("android.provider.ContactsContract$Contacts");
			
				CONTENT_URI=(Uri)clazz.getField("CONTENT_URI").get(clazz);
			//	Log.i("clazz",""+clazz);
			//	Log.i("clazz.getField",""+clazz.getField("CONTENT_URI"));
			//	Log.i("CONTENT_URI",""+CONTENT_URI);
				
			}
			catch (Throwable t) {
				Log.e("PickDemo", "Exception when determining CONTENT_URI", t);
			}
		}
		else {
			CONTENT_URI=Contacts.People.CONTENT_URI;
		}
	}

下面是发起一个供选择的联系人

@Override
	public void onCreate(Bundle icicle) {
		super.onCreate(icicle);
		
		if (CONTENT_URI==null) {
			Toast
				.makeText(this, "We are experiencing technical difficulties...",Toast.LENGTH_LONG)
				.show();
			finish();
			
			return;
		}
		
		setContentView(R.layout.main);
		
		Button btn=(Button)findViewById(R.id.pick);
		
		btn.setOnClickListener(new View.OnClickListener() {
			public void onClick(View view) {
				Intent i=new Intent(Intent.ACTION_PICK, CONTENT_URI);
              // Log.i("CONTENT_URI",""+CONTENT_URI);
				startActivityForResult(i, PICK_REQUEST);
			}
		});
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode,Intent data) {
		if (requestCode==PICK_REQUEST) {
			if (resultCode==RESULT_OK) {
					startActivity(new Intent(Intent.ACTION_VIEW,data.getData()));
					Log.i("data.getData()",""+data.getData());
			}
		}
	}

TabActivity

[功能]

一个TabActivity 包含 数个标签

[代码 步骤]

1. 得到 TabHost 的实例

TabHost host = this.getTabHost();

2. 定义 CustomTabs 用于填充 TabHost 各个标签布局用

public class CustomTabs implements TabHost.TabContentFactory  {
	Activity activity;
	LayoutInflater inflater;
	
	LinearLayout layout;
	
	public CustomTabs (Activity a) {
		activity = a;
		inflater = activity.getLayoutInflater();
	}
	
	/** {@inheritDoc} */
    public View createTabContent(String tag) {
    		activity.setTitle(tag);
    		
    		return addCustomView(tag);
    }
    
    
    public View addCustomView(String id){
    	
    	layout = new LinearLayout(activity);
        layout.setOrientation(LinearLayout.VERTICAL);
        
        
        if(id.equals(TAB1)){
            ImageView iv = new ImageView(activity);
            iv.setImageResource(R.drawable.o);
            layout.addView(iv,
            		new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT));
        }
        else if(id.equals(TAB2)){
        	
            EditText edit = new EditText(activity);
            layout.addView(edit,
            		new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));
            
            Button btn = new Button(activity);
            btn.setText("OK");
            layout.addView(btn,
            		new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
            
            RadioGroup group = new RadioGroup(activity);
            group.setOrientation(LinearLayout.HORIZONTAL);
            RadioButton radio1 = new RadioButton(activity);
            radio1.setText("Radio 1");
            group.addView(radio1);
            RadioButton radio2 = new RadioButton(activity);
            radio2.setText("Radio 2");
            group.addView(radio2);
            
            layout.addView(group,
            		new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT));
        }
        else if(id.equals(TAB3)){
        	
        	LinearLayout.LayoutParams param3 =
                new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT);
        	
            layout.addView(inflater.inflate(R.layout.item_3, null),param3);
        }
        else if(id.equals(TAB4)){
        	
        	LinearLayout.LayoutParams param4 =
                new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT);
        	
            layout.addView(inflater.inflate(R.layout.item_4, null),param4);
        }
        else {
        	TextView tv5 = new TextView(activity);
        	tv5.setText("no resource aviable!");
        	tv5.setGravity(1);
        	
        	layout.addView(tv5,
            		new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.FILL_PARENT));
        }

        return layout;
    }
	
}

3. 使用 CustomTabs

host.addTab(host.newTabSpec(TAB1)
                .setIndicator("Tab 1", getResources().getDrawable(R.drawable.beijing_001_mb5ucom))
                .setContent(item));

4. 标签变化的监听函数

host.setOnTabChangedListener(new OnTabChangeListener(){
			@Override
			public void onTabChanged(String tabId) {
				// TODO Auto-generated method stub
				
			}
        });

5. emulator 运行截图：

 * 标签1

* 标签2

* 标签3

自己一直没有涉足这个东西只是有人问

把相关的东西发在这里 以备将来自己用

Use the java.net classes

String cmd("my command"); 
    try { 
        InetSocketAddress address = new InetSocketAddress("10.1.1.1", 12350); 
        DatagramPacket request = new DatagramPacket(cmd.getBytes(), cmd.length(), address); 
        DatagramSocket socket = new DatagramSocket(); 
        socket.send(request); 
    } catch (SocketException e) { 
 
        ... 
        } 
    } catch (IOException e) { 
 
       ... 
        } 
    } 

其他例子

 here

 using TCP sockets in Java. 和using datagram sockets in Java.