安卓实现简单的登录注册

package com.example.test1;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;


public class MainActivity extends Activity implements OnClickListener{
    /** Called when the activity is first created. */
		//private static final String PREFS_NAME = "MyInfo";//用来保存用户信息
	 	public static EditText Num,Pwd;
	 	private static Button Login,Post,pwdback;
	 	//public static CheckBox RememberPwd,AutoLogin;
		private DBHelper dbHelper;
		public static SQLiteDatabase sdb;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
//        AppConnect.getInstance(this);
//		LinearLayout container =(LinearLayout)findViewById(R.id.AdLinearLayout);   
//		new AdView(this,container).DisplayAd();
      //获得实例对象
        Num=(EditText) findViewById(R.id.et_Num);
        Pwd=(EditText) findViewById(R.id.et_Pwd);
        Login=(Button) findViewById(R.id.btn_Login);
        Post=(Button) findViewById(R.id.Post);
        pwdback = (Button) findViewById(R.id.pwdback);
        Post.setOnClickListener(this);
        Login.setOnClickListener(this);
        pwdback.setOnClickListener(this);
        dbHelper=new DBHelper(this,"Info.db");
        //LoadUserDate();
   
    }
	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		switch(v.getId()){
    	case R.id.btn_Login:
    		if(Num.getText().toString().equals("")){
				Toast.makeText(MainActivity.this,"姓名不能为空 ", Toast.LENGTH_SHORT).show();
				return;
			}
			if(Pwd.getText().toString().equals("")){
				Toast.makeText(MainActivity.this,"号码不能为空 ", Toast.LENGTH_SHORT).show();
				return;
			}
			//SaveUserDate();
			boolean bool=login(Num.getText().toString(),Pwd.getText().toString());
			if(bool){	
				Toast.makeText(MainActivity.this, "登录成功！", Toast.LENGTH_LONG).show();
				Intent intent = new Intent();
				intent.putExtra("name",Num.getText().toString());
				intent.setClass(MainActivity.this, AfterLogin.class);
  				MainActivity.this.startActivity(intent);
		
			}else{
				Toast.makeText(MainActivity.this, "用户名或密码有误！", Toast.LENGTH_LONG).show();
				return;
			}
    		break;
				
    	case R.id.Post:
    		Intent intent=new Intent(MainActivity.this,Register.class);
    		startActivity(intent);

			break;
    	case R.id.pwdback:
    		//System.out.println("被响应");
    		Intent intent1 = new Intent();
			//intent.putExtra("name",Num.getText().toString());
			intent1.setClass(MainActivity.this, pwdback.class);
				MainActivity.this.startActivity(intent1);
				break;
		}
	}

	 //登录
  	public boolean login(String username,String password){
  		String name = new Security().Encryption(username);
  		String pwd = new Security().Encryption(password);
  		/*SQLiteDatabase*/ sdb=dbHelper.getReadableDatabase();
  		String sql="select * from people where name=? and pwd=?";
  		Cursor cursor=sdb.rawQuery(sql, new String[]{name,pwd});		
  		if(cursor.moveToFirst()==true){
  			cursor.close();
  			return true;
  		}
  		return false;
  	}
  	//退出
  	 public boolean onKeyDown(int keyCode, KeyEvent event)  {  
         if (keyCode == KeyEvent.KEYCODE_BACK )   {  
        	 AlertDialog.Builder builder = new Builder(MainActivity.this); 
       		 builder.setIcon(android.R.drawable.ic_dialog_info);
       	        builder.setMessage("确定要退出?"); 
       	        builder.setTitle("提示"); 
       	        builder.setPositiveButton("确认", 
       	                new android.content.DialogInterface.OnClickListener() { 
       	                    public void onClick(DialogInterface dialog, int which) { 
       	                        dialog.dismiss(); 
       	                     MainActivity.this.finish(); 
       	                    } 
       	                }); 
       	        builder.setNegativeButton("取消", 
       	                new android.content.DialogInterface.OnClickListener() { 
       	                    public void onClick(DialogInterface dialog, int which) { 
       	                        dialog.dismiss(); 
       	                    } 
       	                }); 
       	        		builder.create().show();  
         }    
         return false;       
     }
  	 

  	
//  	/**
//	 * 保存用户信息
//	 */
//	private void SaveUserDate() {
//		// 载入配置文件
//		SharedPreferences sp = getSharedPreferences(PREFS_NAME, 0);
//		// 写入配置文件
//		Editor spEd = sp.edit();
//		if (RememberPwd.isChecked()) {
//			spEd.putBoolean("isSave", true);
//			spEd.putString("name", Num.getText().toString());
//			spEd.putString("password", Pwd.getText().toString());
//		} else {
//			spEd.putBoolean("isSave", false);
//			spEd.putString("name", "");
//			spEd.putString("password", "");
//		}
//		spEd.commit();
//	}
//
//	/**
//	 * 载入已记住的用户信息
//	 */
//	private void LoadUserDate() {
//		SharedPreferences sp = getSharedPreferences(PREFS_NAME, 0);
//
//		if (sp.getBoolean("isSave", false)) {
//			String username = sp.getString("name", "");
//			String userpassword = sp.getString("password", "");
//			if (!("".equals(username) && "".equals(userpassword))) {
//				Num.setText(username);
//				Pwd.setText(userpassword);
//				RememberPwd.setChecked(true);
//			}
//		}
//	}
  	    
	 
}

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资源文件列表

test1/.classpath , 491
test1/.project , 841
test1/.settings/org.eclipse.jdt.core.prefs , 177
test1/AndroidManifest.xml , 1295
test1/bin/AndroidManifest.xml , 1295
test1/bin/classes.dex , 726240
test1/bin/classes/com/example/test1/AfterLogin.class , 2741
test1/bin/classes/com/example/test1/BuildConfig.class , 343
test1/bin/classes/com/example/test1/DBHelper.class , 3012
test1/bin/classes/com/example/test1/Limit.class , 4918
test1/bin/classes/com/example/test1/MAC.class , 3134
test1/bin/classes/com/example/test1/MACAdapter.class , 1743
test1/bin/classes/com/example/test1/MainActivity$1.class , 914
test1/bin/classes/com/example/test1/MainActivity$2.class , 884
test1/bin/classes/com/example/test1/MainActivity.class , 4882
test1/bin/classes/com/example/test1/ManageGrade.class , 3854
test1/bin/classes/com/example/test1/MyAdapter.class , 2738
test1/bin/classes/com/example/test1/pwdback.class , 4476
test1/bin/classes/com/example/test1/R$anim.class , 473
test1/bin/classes/com/example/test1/R$attr.class , 337
test1/bin/classes/com/example/test1/R$drawable.class , 1610
test1/bin/classes/com/example/test1/R$id.class , 2219
test1/bin/classes/com/example/test1/R$layout.class , 609
test1/bin/classes/com/example/test1/R$string.class , 424
test1/bin/classes/com/example/test1/R$style.class , 467
test1/bin/classes/com/example/test1/R.class , 616
test1/bin/classes/com/example/test1/Register$1.class , 1137
test1/bin/classes/com/example/test1/Register$2.class , 3863
test1/bin/classes/com/example/test1/Register.class , 3829
test1/bin/classes/com/example/test1/Security.class , 1285
test1/bin/classes/com/example/test1/share.class , 5790
test1/bin/dexedLibs/android-support-v4-0db5facc12b46fc2ca4ed26c3bb50a73.jar , 232610
test1/bin/dexedLibs/annotations-c5d1844c2c6a1f6b823f77032eed1843.jar , 943
test1/bin/dexedLibs/AppOffer_2.0.0-b2cfd6ba7bbc5965aab5fa363c3b933c.jar , 66320
test1/bin/jarlist.cache , 120
test1/bin/resources.ap_ , 65200
test1/bin/res/crunch/drawable-hdpi/app_icon.png , 9923
test1/bin/res/crunch/drawable-hdpi/btn_style_alert_dialog_background.9.png , 1127
test1/bin/res/crunch/drawable-hdpi/btn_style_alert_dialog_button_normal.9.png , 1458
test1/bin/res/crunch/drawable-hdpi/btn_style_alert_dialog_button_pressed.9.png , 1445
test1/bin/res/crunch/drawable-hdpi/btn_style_alert_dialog_cancel_normal.9.png , 1385
test1/bin/res/crunch/drawable-hdpi/btn_style_alert_dialog_special_normal.9.png , 1412
test1/bin/res/crunch/drawable-hdpi/btn_style_alert_dialog_special_pressed.9.png , 1382
test1/bin/res/crunch/drawable-hdpi/checkbox_selected.png , 556
test1/bin/res/crunch/drawable-hdpi/checkbox_selected_press.png , 570
test1/bin/res/crunch/drawable-hdpi/checkbox_unselect.png , 471
test1/bin/res/crunch/drawable-hdpi/checkbox_unselect_press.png , 464
test1/bin/res/crunch/drawable-hdpi/divider_horizontal_line.png , 241
test1/bin/res/crunch/drawable-hdpi/ic_launcher.png , 3966
test1/bin/res/crunch/drawable-hdpi/login_button_nor.9.png , 768
test1/bin/res/crunch/drawable-hdpi/login_button_press.9.png , 759
test1/bin/res/crunch/drawable-hdpi/login_input.9.png , 612
test1/bin/res/crunch/drawable-hdpi/login_input_arrow.png , 225
test1/bin/res/crunch/drawable-hdpi/login_input_arrow1.png , 221
test1/bin/res/crunch/drawable-ldpi/ic_launcher.png , 1537
test1/bin/res/crunch/drawable-mdpi/ic_launcher.png , 2200
test1/bin/test1.apk , 315159
test1/gen/com/example/test1/BuildConfig.java , 159
test1/gen/com/example/test1/R.java , 6508
test1/ic_launcher-web.png , 51394
test1/libs/android-support-v4.jar , 621451
test1/proguard-project.txt , 781
test1/project.properties , 563
test1/res/anim/push_bottom_in.xml , 278
test1/res/anim/push_bottom_in2.xml , 277
test1/res/anim/push_bottom_out.xml , 263
test1/res/drawable-hdpi/app_icon.png , 12642
test1/res/drawable-hdpi/btn_style_alert_dialog_background.9.png , 997
test1/res/drawable-hdpi/btn_style_alert_dialog_button_normal.9.png , 1447
test1/res/drawable-hdpi/btn_style_alert_dialog_button_pressed.9.png , 1366
test1/res/drawable-hdpi/btn_style_alert_dialog_cancel_normal.9.png , 1429
test1/res/drawable-hdpi/btn_style_alert_dialog_special_normal.9.png , 1321
test1/res/drawable-hdpi/btn_style_alert_dialog_special_pressed.9.png , 1313
test1/res/drawable-hdpi/checkbox_selected.png , 556
test1/res/drawable-hdpi/checkbox_selected_press.png , 570
test1/res/drawable-hdpi/checkbox_unselect.png , 471
test1/res/drawable-hdpi/checkbox_unselect_press.png , 464
test1/res/drawable-hdpi/divider_horizontal_line.png , 3057
test1/res/drawable-hdpi/ic_launcher.png , 4147
test1/res/drawable-hdpi/login_button_nor.9.png , 940
test1/res/drawable-hdpi/login_button_press.9.png , 938
test1/res/drawable-hdpi/login_input.9.png , 453
test1/res/drawable-hdpi/login_input_arrow.png , 225
test1/res/drawable-hdpi/login_input_arrow1.png , 221
test1/res/drawable-hdpi/login_reg_normal.9.png , 895
test1/res/drawable-hdpi/login_reg_pressed.9.png , 900
test1/res/drawable-hdpi/logo_bg.jpg , 9196
test1/res/drawable-ldpi/ic_launcher.png , 1723
test1/res/drawable-mdpi/ic_launcher.png , 2574
test1/res/drawable/btn_style_alert_dialog_button.xml , 315
test1/res/drawable/btn_style_alert_dialog_cancel.xml , 316
test1/res/drawable/btn_style_alert_dialog_special.xml , 317
test1/res/drawable/checkbox_bg.xml , 785
test1/res/drawable/login_button_select.xml , 423
test1/res/drawable/login_reg_button.xml , 306
test1/res/layout/afterlogin.xml , 1745
test1/res/layout/limit.xml , 2161
test1/res/layout/mac.xml , 1552
test1/res/layout/main.xml , 3699
test1/res/layout/managegreade.xml , 2958
test1/res/layout/pwdback.xml , 3429
test1/res/layout/register.xml , 4378
test1/res/layout/share.xml , 1563
test1/res/values/strings.xml , 185
test1/res/values/styles.xml , 1050
test1/src/com/example/test1/AfterLogin.java , 2180
test1/src/com/example/test1/DBHelper.java , 3151
test1/src/com/example/test1/Limit.java , 4574
test1/src/com/example/test1/MAC.java , 2037
test1/src/com/example/test1/MACAdapter.java , 849
test1/src/com/example/test1/MainActivity.java , 5887
test1/src/com/example/test1/ManageGrade.java , 2661
test1/src/com/example/test1/MyAdapter.java , 2095
test1/src/com/example/test1/pwdback.java , 3169
test1/src/com/example/test1/Register.java , 4264
test1/src/com/example/test1/Security.java , 965
test1/src/com/example/test1/share.java , 4487