Android入门 HelloWord

 

先说说整个程序要做哪些内容吧，简单helloword 通过一个按钮点击在另一个acitvity出现文本Hello xiaoshengDAI

 

具体包结构如下图

 

 

 

说下做的步骤吧：

 

1.首先新建项目，我这边主要是测试Layout所以项目名就叫这个了。

2.我们要显示一个按钮，难后点击这个按钮就转到其他activity显示Hello xiaoshengDAI，新建类Layout主要来显示第一个activity即button，

   1).在main.xml文件中进行配置

<?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">

    <Button android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="来点我吧"/>

</LinearLayout>

 

 

 

   2).设置监听和跳转actiovity

 

 

package com.layout;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class Layout extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {

        OnClickListener listener1 = null;

        Button botton1 = null;

        listener1 = new OnClickListener(){
            public void onClick(View v) {
                Intent intent0 = new Intent(Layout.this,ActivityFrameLayout.class);
                setTitle("FrameLayout");
                startActivity(intent0);
            }
        };


        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        botton1 = (Button) findViewById(R.id.button1);
        botton1.setOnClickListener(listener1);
    }
}

 

3.新建activityFrameLayout类和activityFrameLayout.xml文件

 

<?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="wrap_content"
    android:text="Hello xiaoshengDAI"
    />
</LinearLayout>

 

package com.layout;

import android.app.Activity;
import android.os.Bundle;

public class ActivityFrameLayout extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setTitle("哈哈");
        setContentView(R.layout.activityframelayout);
    }

}

 

4.对AndroidManifest.xml进行配置，将新建Activity配置文件加进来

 

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.layout"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Layout"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".ActivityFrameLayout" android:label="activityFrameLayout">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
    <uses-sdk android:minSdkVersion="3" />
</manifest>

 5.可以运行了，嘿嘿