Android入门示例完整代码

落日映苍穹つ 2023-10-04 08:13 19阅读 0赞

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2E3NzIzMDQ0MTk_size_16_color_FFFFFF_t_70]

## src/main/`java`/MainActivity.java ##

package com.zhangxueliang.helloworld;
    
    import androidx.appcompat.app.AppCompatActivity;
    
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.TextView;
    import android.widget.Toast;
    
    public class MainActivity extends AppCompatActivity {
        
    
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
        
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_text_view);
            //得到按钮实例
            Button hellobtn = (Button)findViewById(R.id.hellobutton);
            //设置监听按钮点击事件
            hellobtn.setOnClickListener(new View.OnClickListener() {
        
                @Override
                public void onClick(View v) {
        
                    //得到textview实例
                    TextView hellotv = (TextView)findViewById(R.id.hellotextView);
                    //弹出Toast提示按钮被点击了
                    Toast.makeText(MainActivity.this,"Clicked",Toast.LENGTH_SHORT).show();
                    //读取strings.xml定义的interact_message信息并写到textview上
                    hellotv.setText(R.string.interact_message);
                }
            });
        }
    }

## src/main/`res`/`layout`/activity\_text\_view.xml ##

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <TextView
            android:layout_width="fill_parent"
            android:layout_height="180dp"
            android:text="@string/default_message"
            android:id="@+id/hellotextView" android:textColor="#00ff00" android:gravity="center"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/button_send"
            android:id="@+id/hellobutton" android:layout_gravity="center"/>
    </LinearLayout>

### src/main/res/`values`/strings.xml ###

> 字符串变量值定义

<resources>
        <string name="app_name">HelloWorld By ZXL</string>
        <string name="button_send">说点什么吧</string>
        <string name="default_message">点击下面的按钮!</string>
        <string name="interact_message">你点击了该按钮!</string>
    </resources>

## src/`main`/AndroidManifest.xml ##

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.zhangxueliang.helloworld">
    
        <application
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true"
            android:theme="@style/AppTheme">
            <activity android:name=".MainActivity">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
        </application>
    
    </manifest>

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