Android扫描二维码实现网页登录【附源码下载】

【实例简介】

扫描二维码登录的实现机制

 * Android客户端要给网页端发送信息，说登录的是我

 * 网页登录界面要不断的查询是否已经被扫描登录

总体分三步：

① PC端保存randnumber（随机数）

② Android客户端携带username 保存在randnumber那条记录上

③ PC端去服务器轮询，如果randnumber记录的username不为空，则实行登录即可

【核心代码】

package com.carloz.scanqrcode;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.zxing.activity.CaptureActivity;

public class MainActivity extends Activity implements OnClickListener {

	Button btnScan;
	EditText etUsername;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		btnScan = (Button) findViewById(R.id.btnScan);
		btnScan.setOnClickListener(this);
		
		etUsername = (EditText) findViewById(R.id.etUsername);
	}

	@Override
	public void onClick(View v) {
		Intent intent = new Intent(this, CaptureActivity.class);
		startActivityForResult(intent, 0);
	}

	String url = "http://carloz.duapp.com/search/?keywords=";
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		if (resultCode == Activity.RESULT_OK) {
			String result = data.getExtras().getString("result");
			Toast.makeText(this, result, Toast.LENGTH_LONG).show();
			String username = etUsername.getText().toString();
			String url2 = url   username;
			// 访问utl
			HttpUtils.login(url2);
		}
	}

}