标签：String private 冲刺 import et android id
基础的增删改查做完了，剩下的就是界面的优化以及一些功能的改进。
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
标签：String,private,冲刺,import,et,android,id 来源： https://www.cnblogs.com/vvxvv/p/12775553.html
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