Android Studio [登陆界面] _Android

归志宁无五亩园，读书本意在元元。这篇文章主要讲述Android Studio [登陆界面]相关的知识，希望能为你提供帮助。
EdittextActivity.class

package com.xdw.a122; 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.Toast; public class EdittextActivity extends AppCompatActivity {private Button mBtnLogin; private EditText mEtUserName; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_edittext); mBtnLogin=findViewById(R.id.btn_login); mBtnLogin.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Toast.makeText(EdittextActivity.this,"登陆成功!",Toast.LENGTH_LONG).show(); } }); mEtUserName=findViewById(R.id.et_1); mEtUserName.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {}//文字改变之前@Override public void onTextChanged(CharSequence s, int start, int before, int count) { Log.d("edittext",s.toString()); }//文字改变中@Override public void afterTextChanged(Editable s) {}//文字改变之后 }); } }

activity_edittext.xml

< ?xml version="1.0" encoding="utf-8"?>
< RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".EdittextActivity">

< EditText
android:id="@+id/et_1"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginStart="0dp"
android:layout_marginTop="10dp"
android:background="@drawable/bg_username"
android:drawableLeft="@drawable/user1"
android:hint=" 用户名"
android:inputType="text"
android:maxLines="1"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:textColor="#FFAD33"
android:textSize="16sp" />
< EditText
android:id="@+id/et_2"
android:layout_width="match_parent"
android:layout_height="50dp"
android:textSize="16sp"
android:textColor="#FFAD33"
android:drawableLeft="@drawable/pass1"
android:hint=" 密码"
android:inputType="textPassword"
android:background="@drawable/bg_username"
android:layout_below="@+id/et_1"
android:layout_marginTop="15dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"/>
< Button
android:id="@+id/btn_login"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_marginTop="40dp"
android:layout_below="@id/et_2"
android:background="@drawable/bg_btn3"
android:text="登陆"

android:textColor="#fff"
android:textSize="20sp"/>
< /RelativeLayout>

我学习的：

private Button mBtnLogin; mBtnLogin=findViewById(R.id.btn_login); mBtnLogin.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Toast.makeText(EdittextActivity.this,"登陆成功!",Toast.LENGTH_LONG).show(); } });