使用Intent启动Activity

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1.显式启动新的Activity
关键代码

Intent intent = new Intent(MyActivity.this, MyOtherActivity.class);startActivity(intent);

测试案例：
MainActivity.java文件：

package com.example.guocong.activitytest;import android.content.Intent;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);//绑定视图显示        //setContentView(R.layout.activity_second);        //为按钮（id为button）设置点击监听事件       findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {           @Override           public void onClick(View v) {               startActivity(new Intent(MainActivity.this,SecondActivity.class));//打开一个新活动               //startActivity(new Intent(Intent.ACTION_VIEW,Uri.parse("http://www.baidu.com")));//打开一个网址           }       });    }}

activity_main.xml文件：

<?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.guocong.activitytest.MainActivity">    <Button        android:text="Button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@+id/textView"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        android:layout_marginTop="35dp"        android:id="@+id/button" /></RelativeLayout>

activity_second.xml文件：

<?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.guocong.activitytest.SecondActivity">    <TextView        android:id="@+id/textView2"        android:text="活动2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true"        /></RelativeLayout>

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