二個Activity之間的切換

1.在項目中新建一個activity_second.xml和SecondActivity.java.

2.二個布局文件中都定義了一個TextView和Button。

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: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.hsiehway.mysample01.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第一個Activity"
        android:id="@+id/textView" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="切換到第二個Activity"
        android:id="@+id/myBtn01"
        android:layout_below="@+id/textView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
</RelativeLayout>

3.SecondActivity.java

package com.hsiehway.mysample01;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;

public class SecondActivity extends AppCompatActivity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
    }
}

4.在AndroidManifest.xml中聲名SecondActivity

<activity android:name=".SecondActivity"></activity>

5.MainActivity.java

package com.hsiehway.mysample01;

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

public class MainActivity extends AppCompatActivity {

    private Button mybutton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mybutton = (Button)findViewById(R.id.myBtn01);
        //設置mybutton的按鍵監聽器
        mybutton.setOnClickListener(new BtnListener());
    }

    class BtnListener implements View.OnClickListener{
        @Override
        public void onClick(View view) {
            //新建一個Intent對象
            Intent intent =new Intent();
            //指定intent要啟動的類
            intent.setClass(MainActivity.this,SecondActivity.class);
            startActivity(intent);
            //關閉當前Activity
            finish();
        }
    }
}

6.點擊運行,就可以看到效果了.