二个Activity之间的切换

Posted 2020-08-07

1.在项目中新建一个activity_second.xml和SecondActivity.java.

2.二个布局文件中都定义了一个TextView和Button。

activity_main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.hsiehway.mysample01.MainActivity">
11 
12     <TextView
13         android:layout_width="wrap_content"
14         android:layout_height="wrap_content"
15         android:text="第一个Activity"
16         android:id="@+id/textView" />
17 
18     <Button
19         android:layout_width="wrap_content"
20         android:layout_height="wrap_content"
21         android:text="切换到第二个Activity"
22         android:id="@+id/myBtn01"
23         android:layout_below="@+id/textView"
24         android:layout_alignParentLeft="true"
25         android:layout_alignParentStart="true" />
26 </RelativeLayout>

3.SecondActivity.java

 1 package com.hsiehway.mysample01;
 2 
 3 import android.os.Bundle;
 4 import android.support.annotation.Nullable;
 5 import android.support.v7.app.AppCompatActivity;
 6 
 7 public class SecondActivity extends AppCompatActivity {
 8     @Override
 9     protected void onCreate(@Nullable Bundle savedInstanceState) {
10         super.onCreate(savedInstanceState);
11         setContentView(R.layout.activity_second);
12     }
13 }

4.在AndroidManifest.xml中声名SecondActivity

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

5.MainActivity.java

 1 package com.hsiehway.mysample01;
 2 
 3 import android.content.Intent;
 4 import android.support.v7.app.AppCompatActivity;
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.widget.Button;
 8 
 9 public class MainActivity extends AppCompatActivity {
10 
11     private Button mybutton;
12 
13     @Override
14     protected void onCreate(Bundle savedInstanceState) {
15         super.onCreate(savedInstanceState);
16         setContentView(R.layout.activity_main);
17         mybutton = (Button)findViewById(R.id.myBtn01);
18         //设置mybutton的按键监听器
19         mybutton.setOnClickListener(new BtnListener());
20     }
21 
22     class BtnListener implements View.OnClickListener{
23         @Override
24         public void onClick(View view) {
25             //新建一个Intent对象
26             Intent intent =new Intent();
27             //指定intent要启动的类
28             intent.setClass(MainActivity.this,SecondActivity.class);
29             startActivity(intent);
30             //关闭当前Activity
31             finish();
32         }
33     }
34 }

6.点击运行,就可以看到效果了.