数据库删除，存储

布局主要分两个

其中主布局是

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对于ListView的布局定义则是

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自定义的adapter

package com.example.kimdemon.sqllite;import android.content.Context;
import android.database.Cursor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CursorAdapter;
import android.widget.TextView;public class dapter extends CursorAdapter{public dapter(Context context,Cursor cursor){super(context,cursor,0);
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup viewGroup) {return LayoutInflater.from(context).inflate(R.layout.list,viewGroup,false);
}@Override
public void bindView(View view, Context context, Cursor cursor) {TextView name = (TextView) view.findViewById(R.id.yf_name);name.setText(cursor.getString(cursor.getColumnIndex("name")));}
}

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数据库的创建和打开

package com.example.kimdemon.sqllite;import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class Create extends SQLiteOpenHelper {
private String sql="create table student(_id integer primary key autoincrement,"
+"name text not null ,classmate text not null,age integer)";public Create(Context context){super(context,"ManagerInfo",null,1);
}@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {}public void onUpgrade(SQLiteDatabase sqLiteDatabase, int i, int i1) {sqLiteDatabase.execSQL("drop table if exists person");onCreate(sqLiteDatabase);
}
}

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数据库的操作

package com.example.kimdemon.sqllite;import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;public class Manager {
private Create create;
private SQLiteDatabase sqLiteDatabase;public Manager(Context context){
create = new Create(context);}public void insert(String name){sqLiteDatabase = create.getWritableDatabase();String sql = "insert into person(name) values('"+name+"')";sqLiteDatabase.execSQL(sql);}public Cursor selectAll(){sqLiteDatabase = create.getReadableDatabase();Cursor cursor = sqLiteDatabase.query("manager",null,null,null,null,null,null);return cursor;}public void delete(String id){sqLiteDatabase = create.getWritableDatabase();String sql = "delete person where _id="+String.valueOf(id);sqLiteDatabase.execSQL(sql);
}}

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主Java代码则是

package com.example.kimdemon.sqllite;import android.database.Cursor;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.ListView;public class MainActivity extends AppCompatActivity {
private EditText yf_input;
private ListView yf_listview;
private dapter dapter;
private Create create;
private Manager manager;
private Cursor cursor;@Override
protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);yf_input = (EditText) findViewById(R.id.yf_input);
yf_listview = (ListView) findViewById(R.id.yf_listview);manager = new Manager(this);cursor = manager.selectAll();if (cursor != null ){dapter = new dapter(MainActivity.this,cursor);yf_listview.setAdapter(dapter);}
}public void onClick(View view){switch (view.getId()){case R.id.yf_add:String name = yf_input.getText().toString();manager.insert(name);cursor = manager.selectAll();if (cursor != null){dapter = new dapter(this,cursor);yf_listview.setAdapter(dapter);}break;case R.id.yf_delete:
if (cursor != null){if (cursor.moveToFirst()){manager.delete(cursor.getString(cursor.getColumnIndex("_id")));cursor = manager.selectAll();}
}dapter = new dapter(this,cursor);yf_listview.setAdapter(dapter);break;}
}
}