Android之EditText练习

activity_edit_text.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="20dp">
    <EditText
        android:id="@+id/et_1"
        android:layout_width="match_parent"
        android:layout_height="70dp"
        android:textSize="16sp"
        android:textColor="#0066FF"
        android:hint="用户名"
        android:background="@drawable/bg_et_username"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:lineHeight="50dp"
        android:drawableLeft="@drawable/username"
        android:drawablePadding="5dp"
        android:maxLines="1"/>





    <EditText
        android:id="@+id/et_2"
        android:layout_width="match_parent"
        android:layout_height="70dp"
        android:layout_below="@+id/et_1"
        android:layout_marginTop="20dp"
        android:textSize="16sp"
        android:textColor="#0066FF"
        android:hint="密码"
        android:inputType="textPassword"
        android:background="@drawable/bg_et_username"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:drawableLeft="@drawable/password"/>



    <Button
        android:id="@+id/btn_login"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:layout_below="@id/et_2"
        android:layout_marginTop="50dp"
        android:background="@drawable/bg_btn4"
        android:text="登陆"/>

RelativeLayout>

bg_et_username.xml

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <stroke
        android:width="2dp"
        android:color="#999999"/>

    <corners
        android:radius="15dp"/>


shape>

EditTextActivity.java

package com.example.helloword;

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.TextView;
import android.widget.Toast;

public class EditTextActivity extends AppCompatActivity {

    private Button mBtnLogin;//点击事件
    private EditText mEtUserName;//对登录名添加监听事件

    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_edit_text);
        mBtnLogin = (Button)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_SHORT).show();
            }
        });
        mEtUserName = (EditText)findViewById(R.id.et_1);
        mEtUserName.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

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

            @Override
            public void afterTextChanged(Editable editable) {

            }
        });
    }
}

监控界面

效果

EditText练习（Android Emulator - Nexus