寒假学习10

Android Studio:ExitText&&简单登录页面设计

MainActivity.java

package com.example.myapplicationfirst;

import androidx.appcompat.app.AppCompatActivity;

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

public class MainActivity extends AppCompatActivity {

    private Button mBtnTextView;
    private Button mBtnButton;
    private Button mBtnEditText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mBtnTextView = findViewById(R.id.btn_textview);
        mBtnTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //跳转到TextView演示界面
                Intent intent = new Intent(MainActivity.this,TextViewActivity.class);
                startActivity(intent);
            }
        });

        mBtnButton = findViewById(R.id.btn_button);
        mBtnButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //跳转到Button演示界面
                Intent intent = new Intent(MainActivity.this, ButtonActivity.class);
                startActivity(intent);
            }
        });

        mBtnEditText = findViewById(R.id.btn_edittext);
        mBtnEditText.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //跳转到Edittext演示界面
                Intent intent = new Intent(MainActivity.this, EditTextActivity.class);
                startActivity(intent);
            }
        });

    }
}

EditTextActivity.java

package com.example.myapplicationfirst;

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 {

    private Button mEtLogin;
    private EditText mEtUserName;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_edit_text);
        mEtLogin = findViewById(R.id.et_login);
        mEtLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(EditTextActivity.this,"登陆成功!",Toast.LENGTH_SHORT).show();
            }
        });

        mEtUserName = findViewById(R.id.et_1);
        mEtUserName.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) {

            }
        });
    }
}

activity_main.xml

<?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"
        android:textAllCaps="false"/>

    <Button
        android:id="@+id/btn_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button"
        android:textAllCaps="false"/>

    <Button
        android:id="@+id/btn_edittext"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="EditText"
        android:textAllCaps="false"/>

</LinearLayout>

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="50dp"
        android:textSize="24sp"
        android:hint="用户名"
        android:background="@drawable/bg_username"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:maxLines="1"
        android:drawablePadding="5dp" />

    <EditText
        android:id="@+id/et_2"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:textSize="24sp"
        android:inputType="textPassword"
        android:hint="密码"
        android:layout_below="@id/et_1"
        android:layout_marginTop="20dp"
        android:background="@drawable/bg_username"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"/>

    <Button
        android:id="@+id/et_login"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_below="@id/et_2"
        android:layout_marginTop="40dp"
        android:background="@drawable/bg_btn4"
        android:text="登录"
        android:textSize="30sp"
        android:textColor="#fff"
        />

</RelativeLayout>

res>drawable>bg_btn4.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true">
        <shape>
            <solid android:color="#FF1111"/>
            <corners android:radius="20dp"/>
        </shape>
    </item>

    <item android:state_pressed="false">
        <shape>
            <solid android:color="#FFA011"/>
            <corners android:radius="20dp"/>
        </shape>
    </item>

</selector>