【Android开发学习20】多个Activity间的交互之Intent

一、基础知识:

1.一个Intent对象包含了一组信息：
1. Component name 指定启动的Activity
2. Action  要做什么
3. Data    传送数据
4. Category
5. Extras  键值对
6. Flags

 

2.Intent基本用法:

// 生成一个Intent对象Intent intent = new Intent();intent.putExtra("testIntent", "123");// 传递数据intent.setClass(Activity_02.this, OtherActivity.class);// 指定跳向哪一个Activity(第二个参数)//Activity_02.this.startActivity(intent);startActivity(intent);

 

// 接收Intent传过来的数据Intent intent = getIntent();String value = intent.getStringExtra("testIntent");// 接收Intent的数据myTextView = (TextView)findViewById(R.id.myTextView);//myTextView.setText(R.string.other);myTextView.setText(value);

3.按钮事件的注册:

private Button myButton = null;myButton = (Button)findViewById(R.id.myButton);myButton.setOnClickListener(new MyButtonListener());class MyButtonListener implements OnClickListener{@Overridepublic void onClick(View v) {// TODO Auto-generated method stub// 生成一个Intent对象Intent intent = new Intent();intent.putExtra("testIntent", "123");// 传递数据intent.setClass(Activity_02.this, OtherActivity.class);// 指定跳向哪一个Activity(第二个参数)//Activity_02.this.startActivity(intent);startActivity(intent);/*Uri uri = Uri.parse("smsto:0800000123");Intent intent = new Intent(Intent.ACTION_SENDTO, uri);intent.putExtra("sms_body", "The SMS text");startActivity(intent); */}}

 

 

 

 

二、代码展示:

1."Activity_02\src\yan\activity_02\Activity_02.java"

package yan.activity_02;import android.net.Uri;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class Activity_02 extends Activity {private Button myButton = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_02);myButton = (Button)findViewById(R.id.myButton);myButton.setOnClickListener(new MyButtonListener());}class MyButtonListener implements OnClickListener{@Overridepublic void onClick(View v) {// TODO Auto-generated method stub// 生成一个Intent对象Intent intent = new Intent();intent.putExtra("testIntent", "123");intent.setClass(Activity_02.this, OtherActivity.class);//Activity_02.this.startActivity(intent);startActivity(intent);/*Uri uri = Uri.parse("smsto:0800000123");Intent intent = new Intent(Intent.ACTION_SENDTO, uri);intent.putExtra("sms_body", "The SMS text");startActivity(intent); */}}}

 

2."Activity_02\src\yan\activity_02\OtherActivity.java"

package yan.activity_02;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.widget.TextView;public class OtherActivity extends Activity{private TextView myTextView = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.other);Intent intent = getIntent();String value = intent.getStringExtra("testIntent");myTextView = (TextView)findViewById(R.id.myTextView);//myTextView.setText(R.string.other);myTextView.setText(value);}}

3."Activity_02\res\layout\activity_02.xml"

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    >    <Button        android:id="@+id/myButton"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        /></LinearLayout>

4."Activity_02\res\layout\other.xml"

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"    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"        /></LinearLayout>

5."Activity_02\res\values\strings.xml"

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">Activity_02</string>    <string name="hello_world">Hello world!</string>    <string name="menu_settings">Settings</string><string name="other">other string</string></resources>

 

6.“Activity_02\AndroidManifest.xml”

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="yan.activity_02"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="4"        android:targetSdkVersion="4" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="yan.activity_02.Activity_02"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity android:name="yan.activity_02.OtherActivity"            android:label="@string/other" >        </activity>    </application></manifest>

注意这个文件中的activity的声明:

<activity android:name="yan.activity_02.OtherActivity"
            android:label="@string/other" >

</activity>

 

 

 

 

三、效果展示:

点击上面的Button之后-->> 跳转到另一个Activity。

 

 

 

 

 本文完整代码下载地址: http://download.csdn.net/detail/ypist/5138078

 

本文博客源地址:http://blog.csdn.net/ypist