关于启动Activity之间的及普通按钮的点击事件

 1 package lianxi;
 2 
 3 import com.example.jichu_lianxi.R;
 4 
 5 import android.app.Activity;
 6 import android.content.Intent;
 7 import android.os.Bundle;
 8 import android.view.View;
 9 import android.view.View.OnClickListener;
10 import android.widget.Button;
11 
12 public class Mainactivity extends Activity{
13     private Button button_open;    //按钮相应第一步
14     @Override
15     protected void onCreate(Bundle savedInstanceState) {
16         // TODO Auto-generated method stub
17         super.onCreate(savedInstanceState);
18         setContentView(R.layout.mainactivity);
19         button_open = (Button) findViewById(R.id.button_open);//按钮相应第二步
20         button_open.setOnClickListener(new OnClickListener() {  //按钮相应第三步
21             
22             @Override
23             public void onClick(View v) {
24                 // TODO Auto-generated method stub
25                 Intent intent1 = new Intent();       //启动Activity 第一步
26                 intent1.setClass(Mainactivity.this, NewActivity.class);
27                 //启动Activity 第二步，括号中参数第一个是当前Activity,第二个是要启动的Activity
28                 startActivity(intent1);//启动Activity 第三步
29             }
30         });
31     }
32 }

 1 package lianxi;
 2 
 3 import com.example.jichu_lianxi.R;
 4 
 5 import android.app.Activity;
 6 import android.content.Intent;
 7 import android.os.Bundle;
 8 import android.view.View;
 9 import android.view.View.OnClickListener;
10 import android.widget.Button;
11 
12 public class NewActivity extends Activity implements OnClickListener{
13     private Button button_1;       //按钮相应 第一步
14     private Button button_2;
15     private Button button_3;
16     @Override
17     protected void onCreate(Bundle savedInstanceState) {
18         // TODO Auto-generated method stub
19         super.onCreate(savedInstanceState);
20         setContentView(R.layout.newactivity);
21         button_1 = (Button) findViewById(R.id.button_1);  //按钮相应 第二步
22         button_2 = (Button) findViewById(R.id.button_2);
23         button_3 = (Button) findViewById(R.id.button_3);
24         
25         button_1.setOnClickListener(this);   //按钮相应 第三步
26         button_2.setOnClickListener(this);
27         button_3.setOnClickListener(this);
28     
29     }
30     @Override
31     public void onClick(View v) {           //按钮相应 第四步      
32         // TODO Auto-generated method stub
33         switch (v.getId()) {
34         case R.id.button_1:
35                   Intent intent1 = new Intent();
36                   //启动Activity第一步 
37                   intent1.setClass(NewActivity.this, Mainactivity.class);
38                   //启动Activity第二步 
39                   startActivity(intent1);
40                   //启动Activity第三步 
41 
42             break;
43         case R.id.button_2: //参考button_1
44             break;
45         case R.id.button_3://参考button_1
46             break;
47         }
48     }
49 }

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6 
 7     <Button
 8         android:id="@+id/button_open"
 9         android:layout_width="wrap_content"
10         android:layout_height="wrap_content"
11         android:text="@string/open" />
12 
13 </LinearLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:orientation="vertical" >
 6 
 7     <Button
 8         android:id="@+id/button_1"
 9         android:layout_width="wrap_content"
10         android:layout_height="wrap_content"
11         android:text="返回主Activity" />
12 
13     <Button
14         android:id="@+id/button_2"
15         android:layout_width="wrap_content"
16         android:layout_height="wrap_content"
17         android:text="返回主Activity" />
18 
19     <Button
20         android:id="@+id/button_3"
21         android:layout_width="wrap_content"
22         android:layout_height="wrap_content"
23         android:text="返回主Activity" />
24 
25 </LinearLayout>

 1 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 2     package="com.example.jichu_lianxi"
 3     android:versionCode="1"
 4     android:versionName="1.0" >
 5 
 6     <uses-sdk
 7         android:minSdkVersion="8"
 8         android:targetSdkVersion="18" />
 9 
10     <application
11         android:allowBackup="true"
12         android:icon="@drawable/ic_launcher"
13         android:label="@string/app_name"
14         android:theme="@style/AppTheme" >
15         <activity android:name="lianxi.Mainactivity">
16             <intent-filter                           
17                 >
18                 <action android:name="android.intent.action.MAIN"/>                           <category android:name="android.intent.category.LAUNCHER" />                  
19             </intent-filter>
20         </activity>
21         <activity android:name="lianxi.NewActivity"></activity>
22     </application>
23 
24 </manifest>