android课程设计问题简介

<application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.dxxy.lab3.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
       
        <activity
            android:name=".addressbook"
            android:label="@string/app_name" >
           
        </activity>

  Intent intent = new Intent();
  intent.putExtra("name",usernameEditText.getText().toString() );
  intent.putExtra("weichat",passwordEditText.getText().toString());
  intent.setClass(friendadd.this,addressbook.class);
  friendadd.this.startActivity(intent);

Intent intent = getIntent();
        String tnNumber = intent.getStringExtra("name");
        String payMode = intent.getStringExtra("weichat");
       
        ll = (ListView) findViewById(R.id.listView1);             
            ArrayList<HashMap<String,Object>> users = new ArrayList<HashMap<String, Object>>();
            
            HashMap<String, Object> user = new HashMap<String, Object>();
            user.put("pic",tnNumber);                 
            user.put("small", payMode);   
            users.add(user);
            
                  
            SimpleAdapter adapter = new SimpleAdapter(this, users, R.layout.detail, new String[]{"pic","small",},
                              new int[]{R.id.text1,R.id.text2});
                  
            ll.setAdapter(adapter);

public class ChatActivity extends Activity implements OnClickListener{
      
      private Button mBtnSend;
      private Button mBtnBack;
      private EditText mEditTextContent;
      private ListView mListView;
      private ChatMsgViewAdapter mAdapter;
      private List<ChatMsgEntity> mDataArrays = new ArrayList<ChatMsgEntity>();
      
      private  String value;
      protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            setContentView(R.layout.chat_friend);
        //启动activity时不自动弹出软键盘
        getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
       
        Intent intent = getIntent();
        value =intent.getStringExtra("name");
        initView();
        initData();
    }
      public void initView()
    {
      mListView = (ListView) findViewById(R.id.listview);
      mBtnSend = (Button) findViewById(R.id.btn_send);
      mBtnSend.setOnClickListener(this);
      mBtnBack = (Button) findViewById(R.id.btn_back);
      mBtnBack.setOnClickListener(this);
      mBtnBack = (Button) findViewById(R.id.btn_qury);
      mBtnBack.setOnClickListener(this);
      
      mEditTextContent = (EditText) findViewById(R.id.et_sendmessage);
    }
   
  
 
    public void initData()
    {
      
            ChatMsgEntity entity = new ChatMsgEntity();
            entity.setDate(getDate());
            entity.setName(value);
            entity.setMsgType(true);
            mDataArrays.add(entity);
              mAdapter = new ChatMsgViewAdapter(this, mDataArrays);
            mListView.setAdapter(mAdapter);
            
    }
   
      @Override
      public void onClick(View v) {
            // TODO Auto-generated method stub
            switch(v.getId())
            {
            case R.id.btn_send:
                  send();
                  break;
            case R.id.btn_back:
                  Intent intent1 = new Intent (ChatActivity.this,addressbook.class);                
                  startActivity(intent1); 
                  break;
            case R.id.btn_qury:
                  Intent intent2 = new Intent (ChatActivity.this,qury.class);                 
                  startActivity(intent2); 
                  break;
            }
      
      }
      
      private void send()
      {
            String contString = mEditTextContent.getText().toString();
            if (contString.length() > 0)
            {
                  //发送方
                  ChatMsgEntity entity = new ChatMsgEntity();
                  entity.setDate(getDate());
                  entity.setName("李刚");
                  entity.setMsgType(false);
                  entity.setText(contString);
                  
                  mDataArrays.add(entity);
                  mAdapter.notifyDataSetChanged();
                  
                  mEditTextContent.setText("");
                  
                  mListView.setSelection(mListView.getCount() - 1);
                  
                  //接收方
                  ChatMsgEntity entity2 = new ChatMsgEntity();
                  entity2.setName(value);
                  entity2.setMsgType(true);
                  entity2.setText(value+"朋友收到的信息是："+contString);
                  
                  mDataArrays.add(entity2);
                  mAdapter.notifyDataSetChanged();
                  
                  mEditTextContent.setText("");
                  
                  mListView.setSelection(mListView.getCount() - 1);
                  
            }
      }
      
    private String getDate() {
        Calendar c = Calendar.getInstance();
        String year = String.valueOf(c.get(Calendar.YEAR));
        String month = String.valueOf(c.get(Calendar.MONTH));
        String day = String.valueOf(c.get(Calendar.DAY_OF_MONTH) + 1);
        String hour = String.valueOf(c.get(Calendar.HOUR_OF_DAY));
        String mins = String.valueOf(c.get(Calendar.MINUTE));
       
       
        StringBuffer sbBuffer = new StringBuffer();
        sbBuffer.append(year + "-" + month + "-" + day + " " + hour + ":" + mins);
                                          
                                          
        return sbBuffer.toString();
    }
   
    public void head_xiaohei(View v) {     //标题栏 返回按钮
      //Intent intent = new Intent (ChatActivity.this,InfoXiaohei.class);                
            //startActivity(intent);      
      }