学习进度九

练习使用了button，edittext，checkbox，radiobutton。构建出，记账本的登录界面

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
   android:padding="15dp">

  <TextView
      android:id="@+id/tv_1"
      android:layout_width="match_parent"
      android:layout_height="100dp"
      android:text="杨青的记账本"
      android:textColor="#2BB3D5"
      android:gravity="center"
      android:textStyle="italic"
      android:textSize="50dp"/>


  <EditText
      android:id="@+id/et_1"
    android:layout_width="match_parent"
    android:layout_height="60dp"
    android:layout_below="@+id/tv_1"
    android:hint="用户名"
    android:textColor="#111100"
    android:textSize="20sp"
      android:inputType="number"
    />
  <EditText
      android:id="@+id/et_2"
      android:layout_width="match_parent"
      android:layout_height="60dp"
      android:layout_below="@+id/et_1"
      android:hint="密码"
      android:layout_marginTop="15dp"
      android:inputType="textPassword"
      android:textColor="#111100"
      android:textSize="20sp"
      />
  <Button
      android:id="@+id/btn_1"
      android:layout_width="match_parent"
      android:layout_height="60dp"
      android:layout_below="@+id/et_2"
      android:layout_marginTop="15dp"
      android:text="登录"
      android:textSize="20sp"
      android:background="@drawable/pressxiaoguo"
      android:textColor="#FFFFFF"/>

 <CheckBox
     android:id="@+id/ck_1"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="记住密码"
     android:layout_below="@id/btn_1"
     android:layout_marginTop="10dp"
     android:textSize="15sp"/>

  <TextView
      android:id="@+id/tv_2"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="忘记密码"
      android:layout_below="@id/btn_1"
      android:layout_toRightOf="@id/ck_1"
      android:layout_marginTop="15dp"
      android:layout_marginLeft="200dp"
      android:textSize="15sp"
      />

package com.example.a14769.firstapp;

import android.content.Intent;
import android.graphics.Paint;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private EditText met1;
    private EditText met2;
    private Button mbtn1;
    private TextView mtv2;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        met1 = findViewById(R.id.et_1);
        met1 = (EditText) findViewById(R.id.et_1);
        met1.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                 Log.d("edittext",s.toString());
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });
        mbtn1 = (Button) findViewById(R.id.btn_1);
        mbtn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,zhujiemianActivity.class);
                startActivity(intent);
            }
        });



        mtv2 = (TextView) findViewById(R.id.tv_2);
        mtv2.getPaint().setFlags(Paint.UNDERLINE_TEXT_FLAG);//下划线
    }实现了登录界面的基本功能