移動做業

1.SQLite數據庫的DAO標準CRUD操做：

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    private MyDAO myDAO;  //數據庫訪問對象
    private ListView listView;
    private List<Map<String,Object>> listData;
    private Map<String,Object> listItem;
    private SimpleAdapter listAdapter;

    private EditText et_name;  //數據表包含3個字段，第1字段爲自增加類型
    private EditText et_age;

    private  String selId=null;  //選擇項id

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button bt_add= (Button) findViewById(R.id.bt_add);bt_add.setOnClickListener(this);
        Button bt_modify=(Button)findViewById(R.id.bt_modify);bt_modify.setOnClickListener(this);
        Button bt_del=(Button)findViewById(R.id.bt_del);bt_del.setOnClickListener(this);

        et_name=(EditText)findViewById(R.id.et_name);
        et_age=(EditText)findViewById(R.id.et_age);

        myDAO = new MyDAO(this);  //建立數據庫訪問對象
        if(myDAO.getRecordsNumber()==0) {  //防止重複運行時重複插入記錄
            myDAO.insertInfo("xuhuan", 21);   //插入記錄
            myDAO.insertInfo("xill", 21); //插入記錄
        }

        displayRecords();   //顯示記錄
    }
    public void displayRecords(){  //顯示記錄方法定義
        listView = (ListView)findViewById(R.id.listView);
        listData = new ArrayList<Map<String,Object>>();
        Cursor cursor = myDAO.allQuery();
        while (cursor.moveToNext()){
            int id=cursor.getInt(0);  //獲取字段值
            String name=cursor.getString(1);
            //int age=cursor.getInt(2);
            int age=cursor.getInt(cursor.getColumnIndex("age"));//推薦此種方式
            listItem=new HashMap<String,Object>(); //必須在循環體裏新建
            listItem.put("_id", id);  //第1參數爲鍵名，第2參數爲鍵值
            listItem.put("name", name);
            listItem.put("age", age);
            listData.add(listItem);   //添加一條記錄
        }
        listAdapter = new SimpleAdapter(this,
                listData,
                R.layout.list_item, //自行建立的列表項佈局
                new String[]{"_id","name","age"},
                new int[]{R.id.tv_id,R.id.tvname,R.id.tvage});
        listView.setAdapter(listAdapter);  //應用適配器
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {  //列表項監聽
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Map<String,Object> rec= (Map<String, Object>) listAdapter.getItem(position);  //從適配器取記錄
                et_name.setText(rec.get("name").toString());  //刷新文本框
                et_age.setText(rec.get("age").toString());
                Log.i("ly",rec.get("_id").toString());
                selId=rec.get("_id").toString();  //供修改和刪除時使用
            }
        });
    }
    @Override
    public void onClick(View v) {  //實現的接口方法
        if(selId!=null) {  //選擇了列表項後，能夠增長/刪除/修改
            String p1 = et_name.getText().toString().trim();
            int p2 = Integer.parseInt(et_age.getText().toString());
            switch (v.getId()){
                case  R.id.bt_add:
                    myDAO.insertInfo(p1,p2);
                    break;
                case  R.id.bt_modify:
                    myDAO.updateInfo(p1,p2,selId);
                    Toast.makeText(getApplicationContext(),"更新成功！",Toast.LENGTH_SHORT).show();
                    break;
                case  R.id.bt_del:
                    myDAO.deleteInfo(selId);
                    Toast.makeText(getApplicationContext(),"刪除成功！",Toast.LENGTH_SHORT).show();
                    et_name.setText(null);et_age.setText(null); selId=null; //提示
            }
        }else{  //未選擇列表項
            if(v.getId()==R.id.bt_add) {  //單擊添加按鈕
                String p1 = et_name.getText().toString();
                String p2=et_age.getText().toString();
                if(p1.equals("")||p2.equals("")){  //要求輸入了信息
                    Toast.makeText(getApplicationContext(),"姓名和年齡都不能空！",Toast.LENGTH_SHORT).show();
                }else{
                    myDAO.insertInfo(p1, Integer.parseInt(p2));  //第2參數轉型
                }
            } else{   //單擊了修改或刪除按鈕
                Toast.makeText(getApplicationContext(),"請先選擇記錄！",Toast.LENGTH_SHORT).show();
            }
        }
        displayRecords();//刷新ListView對象
    }
}

 

 

2.as微信項目的第三板塊

package com.example.myweixin;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

import android.content.DialogInterface;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.FrameLayout;
import android.widget.ImageButton;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
 private Fragment mtab01=new weixinFragment();
    private Fragment mtab02=new friendFragment();
    private Fragment mtab03=new contactFragment();
    private Fragment mtab04=new setFragment();
    private FragmentManager fm;

    private  LinearLayout mtabweixin;
    private  LinearLayout mtabfrd;
    private  LinearLayout mtabaddress;
    private  LinearLayout mtabset;
    private  ImageButton mimgweixin;
    private  ImageButton mimgfrd;
    private  ImageButton mimgaddress;
    private  ImageButton mimgset;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        initFragment();
   initEvent();

        selectfragment(0);

    }
    private  void initFragment(){
        fm=getSupportFragmentManager();
        FragmentTransaction transaction=fm.beginTransaction();
        transaction.add(R.id.id_content,mtab01);
        transaction.add(R.id.id_content,mtab02);
        transaction.add(R.id.id_content,mtab03);
        transaction.add(R.id.id_content,mtab04);
        transaction.commit();
    }

    private  void initView(){

        mtabweixin=(LinearLayout) findViewById(R.id.weixin);
        mtabfrd=(LinearLayout) findViewById(R.id.frd);
        mtabaddress=(LinearLayout) findViewById(R.id.contact);
        mtabset=(LinearLayout) findViewById(R.id.setting);

        mimgweixin=findViewById(R.id.imageButton1);
        mimgfrd=findViewById(R.id.imageButton2);
        mimgaddress=findViewById(R.id.imageButton3);
        mimgset=findViewById(R.id.imageButton4);
    }
  private  void initEvent(){
        mtabweixin.setOnClickListener(this);
      mtabfrd.setOnClickListener(this);
      mtabaddress.setOnClickListener(this);
      mtabset.setOnClickListener(this);
  }
    private void hidefragment(FragmentTransaction transaction){

        transaction.hide(mtab01);
        transaction.hide(mtab02);
        transaction.hide(mtab03);
        transaction.hide(mtab04);
    }
    private  void  selectfragment(int i){
        FragmentTransaction transaction=fm.beginTransaction();
        hidefragment(transaction);
        switch (i){
            case 0:
                transaction.show(mtab01);
                mimgweixin.setImageResource(R.drawable.tab_weixin_pressed);
                break;
            case 1:
                transaction.show(mtab02);
                mimgfrd.setImageResource(R.drawable.tab_find_frd_pressed);
                break;
            case 2:
                transaction.show(mtab03);
                mimgaddress.setImageResource(R.drawable.tab_address_pressed);
                break;
            case 3:
                transaction.show(mtab04);
                mimgset.setImageResource(R.drawable.tab_settings_pressed);
                break;
            default:
                break;
        }
        transaction.commit();
    }

    @Override
    public void onClick(View v){
        resetimg();

        switch (v.getId()){
            case R.id.imageButton1:
                selectfragment(0);
              System.out.println(v.getId());
                break;
            case R.id.imageButton2:
                selectfragment(1);
                break;
            case R.id.imageButton3:
                selectfragment(2);
                break;
            case R.id.imageButton4:
                selectfragment(3);
                break;
            default:
                break;
        }

    }
    public  void  resetimg(){
        mimgweixin.setImageResource(R.drawable.tab_weixin_normal);
        mimgfrd.setImageResource(R.drawable.tab_find_frd_normal);
        mimgaddress.setImageResource(R.drawable.tab_address_normal);
        mimgset.setImageResource(R.drawable.tab_settings_normal);
    }

}

碼雲地址：https://gitee.com/zhcay/move_job