manifests里的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.chenshuai.test"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme"> <!--谁在前启动谁--> <activity android:name=".Axtivity2"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <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>
layout里新建的layoutactivity.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:weightSum="1"> <!--匹配父窗口 match_parent 包裹内容 wrap_content--> <TextClock android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="大家好" /> </LinearLayout>
layout里MainActivity
package com.hanqi.text3; import android.app.Activity; import android.os.Bundle; //继承了Activity public class MainActivity extends Activity { @Override //覆盖 重写了父类的onCreate() protected void onCreate(Bundle savedInstanceState) { //super 父类 //调用了父类的方法 super.onCreate(savedInstanceState); //设置Java代码和layout文件的关联 //通过R文件的id值 setContentView(R.layout.activity_main); } }
java里新建的Activity2
package com.example.chenshuai.test; import android.app.Activity; import android.os.Bundle; import android.util.Log; /** * Created by chenshuai on 2016/3/16. */ public class Axtivity2 extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.layoutactivity); System.out.println("这是我运行的第一个Activity"); //输出日志 Log.d("test","Log输出的信息"); Log.w("test","Log输出的信息");//warning 蓝色 Log.e("test","Log输出的信息");//eror 红色 Log.i("test","Log输出的信息"); Log.v("test","Log输出的信息"); } }
时间: 2024-10-15 06:00:53