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

package com.example.helloworld;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class SecondLessonDemo1 extends Activity {
 
 private Button myButton = null;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  myButton = (Button) findViewById(R.id.myButton);
  myButton.setOnClickListener(new myButtonListener());
 }

   
 class myButtonListener implements OnClickListener {
  
  public void onClick(View v) {
   //Intent intent = new Intent();
   //intent.putExtra("testIntent", "123");
   //// 从哪里跳转，跳转到哪里去
   //intent.setClass(SecondLessonDemo1.this, SecondLessonDemo2.class);
   //SecondLessonDemo1.this.startActivity(intent);
   
   
   Uri uri=Uri.parse("smsto://0800000123");
   Intent intent=new Intent(Intent.ACTION_SENDTO,uri);
   intent.putExtra("sms_body", "今天天气真好");
   startActivity(intent);
  }
 }
}

2、创建第二个Activity,SecondLessonDemo2.java

package com.example.helloworld;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class SecondLessonDemo2 extends Activity {

 private TextView myTextView = null;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  setContentView(R.layout.other);
  Intent intent=getIntent();
  String value=intent.getStringExtra("testIntent");
  myTextView = (TextView) findViewById(R.id.myTextView);
  myTextView.setText(value);
 }

}

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

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TextView
        android:id="@+id/myTextView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:padding="@dimen/padding_medium"
        tools:context=".MainActivity" />

    <Button
        android:id="@+id/myButton"
        android:text="@+string/ok"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

</RelativeLayout>

4、为第二个Activity创建布局文件，other.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TextView
        android:id="@+id/myTextView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
</RelativeLayout>

5、注册这两个Activity

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.helloworld"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="4"
        android:targetSdkVersion="15" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
          
        </activity>
       
          <activity
            android:name=".SecondLessonDemo1"
            android:label="@string/other">
             <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
          <activity
            android:name=".SecondLessonDemo2"
            android:label="dd">
        </activity>
    </application>

</manifest>