EditText and content acquisition for Android mobile application development

File Directory

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <EditText
        android:hint="请输入用户名"
        android:id="@+id/et"
        android:layout_width="200dp"
        android:layout_height="100dp"
        android:textColorHint="#95a1aa"
        android:inputType="phone"
        />

    <EditText
        android:hint="请输入用户名"
        android:layout_width="200dp"
        android:layout_height="100dp"
        android:textColorHint="#95a1aa"
        android:inputType="numberPassword"
        android:drawableLeft="@drawable/ic_baseline_account_box_24"
        android:drawablePadding="20dp"
        android:paddingLeft="10dp"
        android:background="@color/white"
        />

    <Button
        android:id="@+id/btn"
        android:text="获取用户名"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>

android:hint is the content of the text box initialization (it will disappear after input)
android:inputType The type of the text box, which is set to a digital type (can be set to other types, crtl + that line of code can go in and see the properties) .
android:drawableLeft sets the picture on the left
android:background sets the background color
...

ic_baseline_account_box_24.xml

Is the inserted vector

<vector android:height="24dp" android:tint="#43805B"
    android:viewportHeight="24" android:viewportWidth="24"
    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
    <path android:fillColor="@android:color/white" android:pathData="M3,5v14c0,1.1 0.89,2 2,2h14c1.1,0 2,-0.9 2,-2L21,5c0,-1.1 -0.9,-2 -2,-2L5,3c-1.11,0 -2,0.9 -2,2zM15,9c0,1.66 -1.34,3 -3,3s-3,-1.34 -3,-3 1.34,-3 3,-3 3,1.34 3,3zM6,17c0,-2 4,-3.1 6,-3.1s6,1.1 6,3.1v1L6,18v-1z"/>
</vector>

Can be inserted by itself or directly copied

MainActivity

package zufe.scq.hunter;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {
    
    
    private EditText et;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
    
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button btn = findViewById(R.id.btn);
        et = findViewById(R.id.et);
        btn.setOnClickListener(new View.OnClickListener() {
    
    
            @Override
            public void onClick(View v) {
    
    
                String text = et.getText().toString();
                Log.e("btn", text);
            }
        });
    }
}

GetText can get the content inside

Click Run

Enter username:

Click the Get Username button
to see the output in the console: