Android之EditText练习

activity_edit_text.xml

<?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="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

<?xml version="1.0" encoding="utf-8"?><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

监控界面

效果

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