Activity和Intent

这篇文字是讲怎样创建2个Activity以及这2个Activity直接的数据传输

1、首先创建第一个Activity,SecondLessonDemo1.java

 1 package com.example.helloworld;
 2 import android.app.Activity;
 3 import android.content.Intent;
 4 import android.net.Uri;
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.view.View.OnClickListener;
 8 import android.widget.Button;
 9 
10 public class SecondLessonDemo1 extends Activity {
11  
12  private Button myButton = null;
13 
14  @Override
15  public void onCreate(Bundle savedInstanceState) {
16   super.onCreate(savedInstanceState);
17   setContentView(R.layout.activity_main);
18   myButton = (Button) findViewById(R.id.myButton);
19   myButton.setOnClickListener(new myButtonListener());
20  }
21 
22    
23  class myButtonListener implements OnClickListener {
24   
25   public void onClick(View v) {
26    //Intent intent = new Intent();
27    //intent.putExtra("testIntent", "123");
28    //// 从哪里跳转，跳转到哪里去
29    //intent.setClass(SecondLessonDemo1.this, SecondLessonDemo2.class);
30    //SecondLessonDemo1.this.startActivity(intent);
31    
32    
33    Uri uri=Uri.parse("smsto://0800000123");
34    Intent intent=new Intent(Intent.ACTION_SENDTO,uri);
35    intent.putExtra("sms_body", "今天天气真好");
36    startActivity(intent);
37   }
38  }
39 }

2、创建第二个Activity,SecondLessonDemo2.java

 1 package com.example.helloworld;
 2 
 3 import android.app.Activity;
 4 import android.content.Intent;
 5 import android.os.Bundle;
 6 import android.widget.TextView;
 7 
 8 public class SecondLessonDemo2 extends Activity {
 9 
10  private TextView myTextView = null;
11 
12  @Override
13  protected void onCreate(Bundle savedInstanceState) {
14   // TODO Auto-generated method stub
15   super.onCreate(savedInstanceState);
16   setContentView(R.layout.other);
17   Intent intent=getIntent();
18   String value=intent.getStringExtra("testIntent");
19   myTextView = (TextView) findViewById(R.id.myTextView);
20   myTextView.setText(value);
21  }
22 
23 }

3、为第一个Activity创建布局文件，activity_main.xml

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="fill_parent"
 4     android:layout_height="fill_parent" >
 5 
 6     <TextView
 7         android:id="@+id/myTextView"
 8         android:layout_width="fill_parent"
 9         android:layout_height="wrap_content"
10         android:layout_centerHorizontal="true"
11         android:layout_centerVertical="true"
12         android:padding="@dimen/padding_medium"
13         tools:context=".MainActivity" />
14 
15     <Button
16         android:id="@+id/myButton"
17         android:text="@+string/ok"
18         android:layout_width="fill_parent"
19         android:layout_height="wrap_content" />
20 
21 </RelativeLayout>

4、为第二个Activity创建布局文件，other.xml

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="fill_parent"
 4     android:layout_height="fill_parent" >
 5 
 6     <TextView
 7         android:id="@+id/myTextView"
 8         android:layout_width="fill_parent"
 9         android:layout_height="wrap_content"/>
10 </RelativeLayout>

5、注册这两个Activity

 1 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 2     package="com.example.helloworld"
 3     android:versionCode="1"
 4     android:versionName="1.0" >
 5 
 6     <uses-sdk
 7         android:minSdkVersion="4"
 8         android:targetSdkVersion="15" />
 9 
10     <application
11         android:icon="@drawable/ic_launcher"
12         android:label="@string/app_name"
13         android:theme="@style/AppTheme" >
14         <activity
15             android:name=".MainActivity"
16             android:label="@string/title_activity_main" >
17           
18         </activity>
19        
20           <activity
21             android:name=".SecondLessonDemo1"
22             android:label="@string/other">
23              <intent-filter>
24                 <action android:name="android.intent.action.MAIN" />
25 
26                 <category android:name="android.intent.category.LAUNCHER" />
27             </intent-filter>
28         </activity>
29           <activity
30             android:name=".SecondLessonDemo2"
31             android:label="dd">
32         </activity>
33     </application>
34 
35 </manifest>

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顺势而为