20170118 用Intent啟動Activity

Android練習用Intent啟動Activity
然後這裡要調整第二頁的部分要到
AndroidManifest.xml 新Activity去調整

//20170117 劉彥廷
//用Intent啟動Activity

MainActivity.java

package com.example.user.myapplication35;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public  void  gotoSecondActivity(View v){
        Intent it = new Intent(this,SecondActivity.class);

        startActivity(it);
    }


SecondActivity.java

package com.example.user.myapplication35;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;

public class SecondActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);

    }
    public void goBack(View v ){
        finish();
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.user.myapplication35.MainActivity">

    <Button
        android:text="@string/Button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="60dp"
        android:id="@+id/button1"
        android:onClick="gotoSecondActivity" />
</RelativeLayout>

activity_second.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_second"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.user.myapplication35.SecondActivity">

    <Button
        android:text="@string/Button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginLeft="121dp"
        android:layout_marginStart="121dp"
        android:layout_marginBottom="85dp"
        android:id="@+id/button1"
        android:onClick="goBack" />
</RelativeLayout>

string.xml

<resources>

    <string name="app_name">測試 下一頁No35</string>

    <string name="second">測試 第二頁No35</string>

    <string name="Button1">開啟第二頁</string>

    <string name="Button2">回到第一頁</string>

</resources>

AndroidManifest.xml 這裡新增一個新的activity

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.user.myapplication35">

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        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>

        <activity android:name=".SecondActivity"

                  android:label="@string/second">

        </activity>

    </application>

</manifest>