Android实践——使用Bmob实现登录、注册等功能

Bmob云可以用于云端数据库，使用方便简单，只需要我们在Bmob云注册之后，获取产品apk即可，下面代码就简单介绍了一下

我们可以写一个User类，包含name、password

import cn.bmob.v3.BmobObject;
import cn.bmob.v3.listener.UpdateListener;

public class User extends BmobObject{

private String name;
private String password;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

}

MainActivity类

import java.util.List;
import cn.bmob.v3.Bmob;
import cn.bmob.v3.BmobQuery;
import cn.bmob.v3.listener.DeleteListener;
import cn.bmob.v3.listener.FindListener;
import cn.bmob.v3.listener.SaveListener;
import cn.bmob.v3.listener.UpdateListener;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

private Button btnlogin;

private Button btnregister;

private Button btndelete;

private Button btnupdate;

private EditText txtusername;

private EditText txtpassword;

private String ObjectId;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Bmob.ini
4000
tialize(this, "5f1b3e34ff5b6d3f0896d7acdbfbd64f");//初始化BmobSDK

txtpassword = (EditText) findViewById(R.id.edit_password);
txtusername = (EditText) findViewById(R.id.edit_username);
btnlogin =(Button)findViewById(R.id.btn_login);
btnregister = (Button)findViewById(R.id.btn_register);
btnupdate = (Button)findViewById(R.id.btn_update);
btndelete = (Button)findViewById(R.id.btn_delete);

btnlogin.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
doLogin();
}
});

btnregister.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
doRegister();
}
});

btndelete.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
doDelete();
}
});

btnupdate.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
doUpdate();
}
});
}

private void doRegister(){//注册
BmobQuery<User> query=new BmobQuery<User>();
User user = new User();
user.setName(txtusername.getText().toString());
user.setPassword(txtpassword.getText().toString());
user.save(MainActivity.this, new SaveListener() {

@Override
public void onSuccess() {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this,"register success",3*1000).show();
}

@Override
public void onFailure(int arg0, String arg1) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, arg1, 3*1000).show();
}
});
}

private void doLogin(){//登录
BmobQuery<User> query=new BmobQuery<User>();
String userName=txtusername.getText().toString();
//String userName="123";
query.addWhereEqualTo("name",userName);//增加查询条件
query.setLimit(2);
query.findObjects(MainActivity.this, new FindListener<User>() {

@Override
public void onError(int arg0, String arg1) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, arg1,20*1000).show();
}

@Override
public void onSuccess(List<User> list) {
// TODO Auto-generated method stub
User user=list.get(0);//获取User对象
if(user.getPassword().equals(txtpassword.getText().toString())){
Toast.makeText(MainActivity.this, "login success",3*1000).show();
ObjectId=list.get(0).getObjectId();
}
else{
Toast.makeText(MainActivity.this, "password error",3*1000).show();
}

}
});
}

private void doUpdate(){//更新密码
User user =new User();
user.setObjectId(ObjectId);
user.setPassword(txtpassword.getText().toString());
user.update(MainActivity.this, new UpdateListener() {

@Override
public void onSuccess() {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, "update success",3*1000).show();
}

@Override
public void onFailure(int arg0, String arg1) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, arg1,3*1000).show();
}
});
}

private void doDelete(){//删除
User user = new User();
user.setObjectId(ObjectId);
user.delete(MainActivity.this, new DeleteListener() {

@Override
public void onSuccess() {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, "delete success",3*1000).show();
}

@Override
public void onFailure(int arg0, String arg1) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, arg1,3*1000).show();
}
});
}

}

注意在AndroidManifest中添加权限

<uses-permission android:name="android.permission.INTERNET"/>

Bmob后端