AndroidStudio制作登录和注册功能的实现，界面的布局介绍

public class StartActivity extends AppCompatActivity implements View.OnClickListener{

    TextView tv_regist;
    EditText et_login_user, et_login_password;
    Button bt_login;
    TextView tv_forget;
    String user_num;
    /**
     * ATTENTION: This was auto-generated to implement the App Indexing API.
     * See https://g.co/AppIndexing/AndroidStudio for more information.
     */


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //加载主题
        final ColorTheme newTheme = new ColorTheme(this);
        newTheme.loadTheme();

        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_start);
        Bmob.initialize(this, "40de716427e259476d34aa6e0a7e4555");

        tv_regist = (TextView) findViewById(R.id.tv_regist);
        bt_login = (Button) findViewById(R.id.login);
        tv_forget = (TextView) findViewById(R.id.tv_forget);
        et_login_user = (EditText) findViewById(R.id.et_login_user);
        et_login_password = (EditText) findViewById(R.id.et_login_password);
        tv_regist.setOnClickListener(StartActivity.this);
        bt_login.setOnClickListener(StartActivity.this);
        tv_forget.setOnClickListener(StartActivity.this);


        //改变控件颜色位默认
        TypedValue typedValue = new  TypedValue();
        getTheme().resolveAttribute(R.attr.colorPrimary, typedValue, true);
        GradientDrawable myGrad = (GradientDrawable)bt_login.getBackground();
        myGrad.setColor(typedValue.data);

    }


    @Override
    public void onClick(View arg0) {
        // TODO Auto-generated method stub
        switch (arg0.getId()) {
            case R.id.tv_regist:
                Intent intent_regist = new Intent(StartActivity.this, RegistActivity.class);
                startActivity(intent_regist);
                break;
            case R.id.tv_forget:
                Intent intent_forget = new Intent(StartActivity.this, MobileLoad.class);
                startActivity(intent_forget);
                break;
            case R.id.login:
                user_num = et_login_user.getText().toString();
                String user_password = et_login_password.getText().toString().trim();
                // 非空验证
                if (user_num.isEmpty() || user_password.isEmpty()) {
                    Toast.makeText(StartActivity.this, "账号或密码不能为空", Toast.LENGTH_SHORT).show();
                    return;
                }
                User bu2 = new User();
                bu2.setUsername(user_num);
                bu2.setPassword(user_password);
                // 使用BmobSDK提供的登录功能

                bu2.login(new SaveListener<BmobUser>() {

                    @Override
                    public void done(BmobUser bmobUser, BmobException e) {
                        if(e==null){
                            Toast.makeText(StartActivity.this, "登陆成功", Toast.LENGTH_SHORT).show();
                            Intent intent_main = new Intent(StartActivity.this, MainActivity.class);
                            startActivity(intent_main);
                            login p2 = new login();
                            p2.setName(user_num);
                            p2.update("o0HXjjjl", new UpdateListener() {

                                @Override
                                public void done(BmobException e) {
                                    if(e==null){
                                    }else{
                                    }
                                }

                            });
                            //通过BmobUser user = BmobUser.getCurrentUser()获取登录成功后的本地用户信息
                            //如果是自定义用户对象MyUser，可通过MyUser user = BmobUser.getCurrentUser(MyUser.class)获取自定义用户信息
                        }else{
                            Toast.makeText(StartActivity.this, "登陆失败", Toast.LENGTH_SHORT).show();

                            //loge(e);

                        }
                    }
                });

                break;
        }
    }

public class RegistActivity extends AppCompatActivity implements View.OnClickListener {

dler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            if((Integer)msg.obj==0){
                imageView01.setImageBitmap(bitmap);
            }
            super.handleMessage(msg);
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //加载主题
        final ColorTheme newTheme = new ColorTheme(this);
        newTheme.loadTheme();

        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_regist);

        Bmob.initialize(this, "\n" + "40de716427e259476d34aa6e0a7e4555");
        chnage();

        imageView01 = (ImageView) findViewById(R.id.head_portrait);
        et_regist_user= (EditText)findViewById(R.id.et_regist_user);
        et_regist_password= (EditText) findViewById(R.id.et_regist_password);
        et_regist_fullname = (EditText) findViewById(R.id.et_regist_fullname);
        et_regist_group= (EditText) findViewById(R.id.et_regist_group);
        et_regist_telephone = (EditText) findViewById(R.id.et_regist_telephone);
        et_regist_againpassword = (EditText) findViewById(R.id.et_regist_againpassword) ;
        bt_regist_save= (Button) findViewById(R.id.bt_regist_save);
        bt_regist_cancel= (Button) findViewById(R.id.bt_regist_cancel);

        bt_regist_save.setOnClickListener(this);
        bt_regist_cancel.setOnClickListener(this);
        imageView01.setOnClickListener(this);

        //改变控件颜色位主题色
        TypedValue typedValue = new  TypedValue();
        getTheme().resolveAttribute(R.attr.colorPrimary, typedValue, true);
        GradientDrawable myGrad = (GradientDrawable)bt_regist_save.getBackground();
        myGrad.setColor(typedValue.data);
        myGrad = (GradientDrawable)bt_regist_cancel.getBackground();
        myGrad.setColor(typedValue.data);
    }

    @Override
    public void onClick(View v) {
        switch(v.getId()){
            case R.id.bt_regist_save:
                File file = new File(PathGetter.getPath(this, uri));
                BmobFile bmobFile = new BmobFile(file);

                final String user_num=et_regist_user.getText().toString();
                final String user_password=et_regist_password.getText().toString().trim();
                final String user_fullname = et_regist_fullname.getText().toString().trim();
                final String user_group = et_regist_group.getText().toString().trim();
                final String user_telephone = et_regist_telephone.getText().toString().trim();
                final String user_againpassword = et_regist_againpassword.getText().toString().trim();
                // 非空验证
                if (user_num.isEmpty() || user_password.isEmpty() || user_fullname.isEmpty() ||  user_group.isEmpty()  ||  user_telephone.isEmpty() ||user_againpassword.equals(user_password)==false) {
                    Toast.makeText(RegistActivity.this, "有未填项", Toast.LENGTH_SHORT).show();
                    return;
                }

                // 使用BmobSDK提供的注册功能
                final User myUser=new User();
                myUser.setImg(bmobFile);
                //用uploadblock将图片上传至服务器
                myUser.getImg().uploadblock(new UploadFileListener() {
                    @Override
                    public void done(BmobException e) {
                        if (e == null) {
                            Toast.makeText(getApplicationContext(), "上传成功!!", Toast.LENGTH_SHORT).show();

                            //将用户输入的信息存入p2，准备存入数据库
                            myUser.setUsername(user_num);
                            myUser.setPassword(user_password);
                            myUser.setFullname(user_fullname);
                            myUser.setGroup(user_group);
                            myUser.setTelephone(user_telephone);
                            myUser.setAgainpassword(user_againpassword);
                            //将p2整个对象存入数据库
                            myUser.signUp(new SaveListener<String>() {
                                @Override
                                public void done(String objectId,BmobException e) {

                                    if(e==null){
                                        Toast.makeText(getApplicationContext(),"添加数据成功，返回objectId为："+objectId,Toast.LENGTH_SHORT).show();
                                    }else{
//                                        Toast.makeText(getApplicationContext(),"创建数据失败：" + e.getMessage(),Toast.LENGTH_SHORT).show();
                                    }
                                }
                            });
                        }else {
                            Toast.makeText(getApplicationContext(), "上传失败--", Toast.LENGTH_SHORT).show();
                        }
                    }
                });

                //注意：不能用save方法进行注册
                finish();
                break;

            case R.id.head_portrait:
                if(ContextCompat.checkSelfPermission(RegistActivity.this,
                        Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){
                    ActivityCompat.requestPermissions(RegistActivity.this,new String[]{
                            Manifest.permission.WRITE_EXTERNAL_STORAGE
                    },1);
                }
                Intent intent = new Intent(Intent.ACTION_PICK,
                        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                startActivityForResult(intent, IMAGE_REQUEST_CODE);
                break;

            case R.id.bt_regist_cancel:
                Toast.makeText(this,"hhh",Toast.LENGTH_SHORT).show();
                finish();
                break;

            default:
                break;
        }
    }

    /**
     * 从相册获得图片
     */

    /*
    定义一个Handler，定义延时执行的行为
     */
    public  void chnage(){
        new Thread(){
            @Override
            public void run() {
                while ( bitmap == null ){
                    bitmap = BitmapFactory.decodeFile(path);
                }
                Message message = handler.obtainMessage();
                message.obj = 0;
                handler.sendMessage(message);
            }
        }.start();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        //在相册里面选择好相片之后调回到现在的这个activity中
        switch (requestCode) {
            case IMAGE_REQUEST_CODE://这里的requestCode是我自己设置的，就是确定返回到那个Activity的标志
                if (resultCode == RESULT_OK) {//resultcode是setResult里面设置的code值
                    try {
                        Uri selectedImage = data.getData(); //获取系统返回的照片的Uri
                        uri = selectedImage;
                        String[] filePathColumn = {MediaStore.Images.Media.DATA};
                        Cursor cursor = getContentResolver().query(selectedImage,
                                filePathColumn, null, null, null);//从系统表中查询指定Uri对应的照片
                        cursor.moveToFirst();
                        int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                        path = cursor.getString(columnIndex);  //获取照片路径

                        int index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                        cursor.moveToFirst();
                        imgpath = cursor.getString(index);
                        cursor.close();
                        BitmapFactory.Options options = new BitmapFactory.Options();
                        options.inSampleSize = 1;
                        bitmap = BitmapFactory.decodeFile(path,options);
                        imageView01.setImageBitmap(bitmap);
                        chnage();
                        Toast.makeText(RegistActivity.this,path,Toast.LENGTH_SHORT).show();
                    } catch (Exception e) {
                        // TODO Auto-generatedcatch block
                        e.printStackTrace();
                    }
                }
                break;
        }
    }
}

    //用户头像
    ImageView imageView01 ;
    //昵称
    EditText et_regist_user;
    //密码
    EditText et_regist_password;
    //再次输入密码
    EditText et_regist_againpassword;
    //真实姓名
    EditText et_regist_fullname;
    //组别
    EditText et_regist_group;
    //手机号
    EditText et_regist_telephone;
    //提交注册信息与取消
    Button bt_regist_save,bt_regist_cancel;
    //记录数组长度
    int arr_num = 0;
    //定义一个数组
    String[] arr1 = new String[arr_num];
    //从相册获得图片
    Bitmap bitmap;
    //判断返回到的Activity
    private static final int IMAGE_REQUEST_CODE = 0;
    //图片路径
    private String path ;
    //图片路径
    Uri uri ;
    //图片上传路径
    String imgpath;
    //用于延时处理
    private Han