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  • 4.25成果(冲刺1.8)

    1.预期任务量:40h;已花时间:6h;剩余时间:6h。

    2.

    3.

    4.

    package com.example.myapplicationthree;
    
    import android.app.Activity;
    import android.content.ContentValues;
    import android.database.Cursor;
    import android.database.sqlite.SQLiteDatabase;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.View;
    import android.widget.AdapterView;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.ListView;
    import android.widget.SimpleAdapter;
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.Map;
    public class MainActivity extends Activity {
        private static String DB_NAME = "mydb";
        private EditText et_leixing;
        private EditText et_riqi;
        private EditText et_jine;
        private EditText et_beizhu;
        private ArrayList<Map<String, Object>> data;
        private dbHelper dbHelper;
        private SQLiteDatabase db;
        private Cursor cursor;
        private SimpleAdapter listAdapter;
        private View view;
        private ListView listview;
        private Button selBtn, addBtn, updBtn, delBtn;
        private Map<String, Object> item;
        private String selId;
        private ContentValues selCV;
        /**
         * Called when the activity is first created.
         */
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            et_leixing = (EditText) findViewById(R.id.et_leixing);
            et_riqi = (EditText) findViewById(R.id.et_riqi);
            et_jine = (EditText) findViewById(R.id.et_jine);
            et_beizhu = (EditText) findViewById(R.id.et_beizhu);
            listview = (ListView) findViewById(R.id.listView);
            selBtn = (Button) findViewById(R.id.bt_query);
            addBtn = (Button) findViewById(R.id.bt_add);
            updBtn = (Button) findViewById(R.id.bt_modify);
            delBtn = (Button) findViewById(R.id.bt_del);
            selBtn.setOnClickListener(new Button.OnClickListener() {
                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    dbFindAll();
                }
            });
            addBtn.setOnClickListener(new Button.OnClickListener() {
                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    dbAdd();
                    dbFindAll();
                }
            });
            updBtn.setOnClickListener(new Button.OnClickListener() {
                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    dbUpdate();
                    dbFindAll();
                }
            });
            delBtn.setOnClickListener(new Button.OnClickListener() {
                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    dbDel();
                    dbFindAll();
                }
            });
            dbHelper = new dbHelper(this, DB_NAME, null, 1);
            db = dbHelper.getWritableDatabase();// 打开数据库
            data = new ArrayList<Map<String, Object>>();
            dbFindAll();
            listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
                    // TODO Auto-generated method stub
                    Map<String, Object> listItem = (Map<String, Object>) listview.getItemAtPosition(position);
                    et_leixing.setText((String) listItem.get("leixing"));
                    et_riqi.setText((String) listItem.get("riqi"));
                    et_jine.setText((String) listItem.get("jine"));
                    et_beizhu.setText((String) listItem.get("beizhu"));
                    selId = (String) listItem.get("_id");
                    Log.i("mydbDemo", "id=" + selId);
                }
            });
        }
        //数据删除
        protected void dbDel() {
            // TODO Auto-generated method stub
            String where = "_id=" + selId;
            int i = db.delete(dbHelper.TB_NAME, where, null);
            if (i > 0)
                Log.i("myDbDemo", "数据删除成功!");
            else
                Log.i("myDbDemo", "数据未删除!");
        }
        private void showList() {
            // TODO Auto-generated method stub
            listAdapter = new SimpleAdapter(this, data,
                    R.layout.listview, new String[]{"_id", "leixing", "riqi","jine","beizhu"}, new int[]{R.id.tvID, R.id.tvLX, R.id.tvRQ, R.id.tvJE, R.id.tvBZ});
            listview.setAdapter(listAdapter);
        }
        //更新列表中的数据
        protected void dbUpdate() {
            // TODO Auto-generated method stub
            ContentValues values = new ContentValues();
            values.put("leixing", et_leixing.getText().toString().trim());
            values.put("riqi", et_riqi.getText().toString().trim());
            values.put("jine", et_jine.getText().toString().trim());
            values.put("beizhu", et_beizhu.getText().toString().trim());
            String where = "_id=" + selId;
            int i = db.update(dbHelper.TB_NAME, values, where, null);
            if (i > 0)
                Log.i("myDbDemo", "数据更新成功!");
            else
                Log.i("myDbDemo", "数据未更新");
        }
        //插入数据
        protected void dbAdd() {
            // TODO Auto-generated method stub
            ContentValues values = new ContentValues();
            values.put("leixing", et_leixing.getText().toString().trim());
            values.put("riqi", et_riqi.getText().toString().trim());
            values.put("jine", et_jine.getText().toString().trim());
            values.put("beizhu", et_beizhu.getText().toString().trim());
            long rowid = db.insert(dbHelper.TB_NAME, null, values);
            if (rowid == -1)
                Log.i("myDbDemo", "数据插入失败!");
            else
                Log.i("myDbDemo", "数据插入成功!" + rowid);
        }
        //查询数据
        protected void dbFindAll() {
            // TODO Auto-generated method stub
            data.clear();
            cursor = db.query(dbHelper.TB_NAME, null, null, null, null, null, "_id ASC");
            cursor.moveToFirst();
            while (!cursor.isAfterLast()) {
                String id = cursor.getString(0);
                String leixing = cursor.getString(1);
                String jine = cursor.getString(2);
                String riqi = cursor.getString(3);
                String beizhu = cursor.getString(4);
                item = new HashMap<String, Object>();
                item.put("_id", id);
                item.put("leixing", leixing);
                item.put("jine", jine);
                item.put("riqi", riqi);
                item.put("beizhu", beizhu);
                data.add(item);
                cursor.moveToNext();
            }
            showList();
        }
    }
    View Code
    package com.example.myapplicationthree;
    
    import android.content.Context;
    import android.database.sqlite.SQLiteDatabase;
    import android.database.sqlite.SQLiteDatabase.CursorFactory;
    import android.database.sqlite.SQLiteOpenHelper;
    
    public class dbHelper extends SQLiteOpenHelper {
        public static final String TB_NAME = "friends";
        public dbHelper(Context context, String name, CursorFactory factory, int version) {
            super(context, name, factory, version);
            // TODO Auto-generated constructor stub
        }
        @Override
        public void onCreate(SQLiteDatabase db) {
            // TODO Auto-generated method stub
            db.execSQL("CREATE TABLE IF NOT EXISTS " +
                    TB_NAME + " ( _id integer primary key autoincrement," +
                    "leixing varchar," +
                    "riqi varcher,"+
                    "jine integer,"+
                    "beizhu varcher" +
                    ") ");
        }
        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            // TODO Auto-generated method stub
            db.execSQL("DROP TABLE IF EXISTS " + TB_NAME);
            onCreate(db);
        }
    }
    View Code
    <?xml version="1.0" encoding="utf-8"?>
    
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical">
    
        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:addStatesFromChildren="true">
    
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="类型"
                android:textColor="?android:attr/textColorSecondary" />
    
            <EditText
                android:id="@+id/et_leixing"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:singleLine="true" />
        </LinearLayout>
    
        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:addStatesFromChildren="true">
    
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="日期"
                android:textColor="?android:attr/textColorSecondary" />
    
            <EditText
                android:id="@+id/et_riqi"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:singleLine="true" />
        </LinearLayout>
    
        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:addStatesFromChildren="true">
    
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="金额"
                android:textColor="?android:attr/textColorSecondary" />
    
            <EditText
                android:id="@+id/et_jine"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:singleLine="true" />
        </LinearLayout>
    
        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:addStatesFromChildren="true">
    
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="备注"
                android:textColor="?android:attr/textColorSecondary" />
    
            <EditText
                android:id="@+id/et_beizhu"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:singleLine="true" />
        </LinearLayout>
    
        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:addStatesFromChildren="true"
            android:gravity="center">
    
            <Button
                android:id="@+id/bt_add"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="addbutton"
                android:text="添加">
            </Button>
    
            <Button
                android:id="@+id/bt_modify"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="updatebutton"
                android:text="修改">
            </Button>
    
            <Button
                android:id="@+id/bt_del"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="updatebutton"
                android:text="删除">
            </Button>
    
            <Button
                android:id="@+id/bt_query"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:onClick="querybutton"
                android:text="查询">
            </Button>
    
        </LinearLayout>
    
        <ListView
            android:id="@+id/listView"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:padding="5dip">
        </ListView>
    </LinearLayout>
    View Code
    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/linear"
        android:layout_width="fill_parent"
        android:layout_height="50dp"
        android:orientation="vertical"
        android:padding="5dip">
    
        <LinearLayout
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:layout_width="fill_parent"
            android:orientation="horizontal">
    
            <TextView
                android:id="@+id/tvID"
                android:layout_width="80dp"
                android:layout_height="wrap_content" />
    
            <TextView
                android:id="@+id/tvLX"
                android:layout_width="80dp"
                android:layout_height="wrap_content" />
    
            <TextView
                android:id="@+id/tvRQ"
                android:layout_width="80dp"
                android:layout_height="wrap_content" />
    
            <TextView
                android:id="@+id/tvJE"
                android:layout_width="80dp"
                android:layout_height="wrap_content" />
    
        </LinearLayout>
    
        <LinearLayout
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:layout_width="fill_parent"
            android:orientation="horizontal">
    
            <TextView
                android:id="@+id/tvBZ"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent" />
    
        </LinearLayout>
    
    </LinearLayout>
    View Code
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  • 原文地址:https://www.cnblogs.com/RGTD/p/12792378.html
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