android sqlite 增删查 demo

package com.example.wtw.learnlayout;import android.app.AlertDialog;import android.app.ListActivity;import android.content.ContentValues;import android.content.DialogInterface;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.support.v7.app.AppCompatActivity;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.LinearLayout;import android.widget.ListView;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.SimpleCursorAdapter;import android.widget.Toast;import com.example.wtw.common.Db;public class ListViewActivity extends ListActivity {    private SimpleCursorAdapter adapter;    private EditText edName;    //private EditText edSex;    RadioGroup edSex;    private Button add;    private Db db;    private SQLiteDatabase dbRead;    private SQLiteDatabase dbWrite;    //添加按钮事件    private View.OnClickListener addbtn = new View.OnClickListener() {        @Override        public void onClick(View v) {            ContentValues cv = new ContentValues();            if (edName.getText().toString().isEmpty()                    //|| edSex.getText().toString().isEmpty()                    || edSex.getCheckedRadioButtonId()==-1                    ){                Toast.makeText(v.getContext(),"不能为空",Toast.LENGTH_SHORT).show();            }else{                String name = edName.getText().toString();                //String sex = edSex.getText().toString();                RadioButton r = (RadioButton) findViewById(edSex.getCheckedRadioButtonId());                Log.i("mylog","radioID="+edSex.getCheckedRadioButtonId());                String sex = r.getText().toString();                cv.put("name",name);                cv.put("sex",sex);                dbWrite.insert("user",null,cv);                Toast.makeText(v.getContext(),"成功",Toast.LENGTH_SHORT).show();                Log.i("mylog","新增成功");                refreshListView();            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_list_view);        edName = (EditText) findViewById(R.id.edName);        //edSex = (EditText) findViewById(R.id.edSex);        edSex = (RadioGroup) findViewById(R.id.edSex);        add = (Button) findViewById(R.id.btn_add);        add.setOnClickListener(addbtn);        db = new Db(this);        dbRead = db.getReadableDatabase();        dbWrite = db.getWritableDatabase();        adapter = new SimpleCursorAdapter(this,R.layout.user_list,null,new String[]{"name","sex"},new int[]{R.id.tvName,R.id.tvSex});        Log.i("mylog","正在加载LISTVIEW数据");        setListAdapter(adapter);        refreshListView();        //listview 添加长按事件        getListView().setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {            @Override            public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {                //弹出框,title设置弹出框的标题，message设置弹出框的内容,negative设置取消按钮,positive设置确定按钮及事件                new AlertDialog.Builder(ListViewActivity.this).setTitle("提醒")                        .setMessage("您确定删除该项吗?")                        .setNegativeButton("取消",null)                        .setPositiveButton("确定", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialog, int which) {                        Cursor c = adapter.getCursor();                        //c.moveToPosition(position);//从LISTVIEW 中移除                        int itemid = c.getInt(c.getColumnIndex("_id"));                        Log.i("mylog","删除ID="+itemid);                        dbWrite.delete("user","_id=?",new String[]{itemid+""});//在数据库中删除数据                        refreshListView();//刷新                    }                }).show();                return true;            }        });    }    //刷新    public void refreshListView(){        Cursor c = dbRead.query("user",null,null,null,null,null,null,null);        adapter.changeCursor(c);    }}
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