Android之EditText

• 常用属性
• 监听事件
• 制作登陆页面

MainActivity对应的布局页面

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical">

    <Button
        android:id="@+id/btn_textview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="TextView"
    />


    <Button
        android:id="@+id/btn_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="这节课是Button"
    />


	本章博客对应的内容
    <Button
        android:id="@+id/btn_editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="EditText"
        android:textAllCaps="false"
        />

    
</LinearLayout>

MainActivity

package com.example.test0508;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    private Button mBtnEditText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mBtnEditText = findViewById(R.id.btn_editText);
        mBtnEditText.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //跳转到EditText页面
                Intent intent = new Intent(MainActivity.this,EditTextActivity.class);
                startActivity(intent);
            }
        });
    }
}

---

正文
EditTextActivity对应的xml布局文件

<?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"
    >

<!--    登入页面的用户名-->
    <EditText
        android:id="@+id/et_1"
        android:layout_width="match_parent"
        android:layout_height="65dp"
        android:textSize="16sp"
        android:textColor="#FFD700"
        android:hint="用户名"
        android:background="@drawable/bg_username"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:drawableLeft="@drawable/pciture1"
        android:drawablePadding="5dp"
        android:maxLines="1"
        android:layout_marginTop="20dp"
    />


<!--    登入页面的密码模块-->
    <EditText
        android:id="@+id/et_2"
        android:layout_width="match_parent"
        android:layout_height="70dp"
        android:textSize="16sp"
        android:textColor="#FFD700"
        android:inputType="textPassword"
        android:hint="请输入密码"
        android:layout_below="@id/et_1"
        android:layout_marginTop="10dp"
        android:background="@drawable/bg_username"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:drawableLeft="@drawable/picture2"
        android:drawablePadding="5dp"
        android:maxLines="1"
        />

<!--按钮提交模块-->
    <Button
        android:id="@+id/btn_login"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_below="@id/et_2"
        android:layout_marginTop="30dp"
        android:text="登陆"
        android:textSize="20sp"
        android:background="@drawable/bg_btn4"
    />
</RelativeLayout>

---

drawable的文件

bg_username.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

<!--    描边-->
    <stroke
        android:width="5dp"
        android:color="#8A8A8A"
        />

<!--    圆角-->
    <corners android:radius="50dp" />

</shape>

---

回到EditTextActivity

package com.example.test0508;

import androidx.appcompat.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 {
    //点击事件
    private Button loginButton;

    //设置监听事件
    private EditText mEtUserName;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_edit_text);
        /*
            点击事件
         */
        loginButton = findViewById(R.id.btn_login);
        loginButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(EditTextActivity.this,"登入成功",Toast.LENGTH_SHORT).show();
            }
        });


        /*
            监听事件
         */
        mEtUserName = findViewById(R.id.et_1);
        mEtUserName.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                Log.d("edittext",charSequence.toString());
            }

            @Override
            public void afterTextChanged(Editable editable) {

            }
        });

    }
}