Android应用间数据传递与意图使用详解-优快云博客

学习意图将数据传递给目标活动; 初学者需要好好研究的

1,将下面的代码添加到main.xml中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
    <Button
    android:id="@+id/btn_SecondActivity"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Click to go to Second Activity"
    android:onClick="onClick"
        />

</LinearLayout>

2,将下面的代码添加到second.xml中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
    <TextView  
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Welcom to Second Activity"
        />
    <Button
        android:id="@+id/btn_MainActivity"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Click to return to mian activity"
        android:onClick="onClick"
        />

</LinearLayout>

3,在src中创建信的class文件mainBundle.java

package com.example.listener;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

/**
 * 
 * @author Administrator 意图返回值的使用联系 返回码,结果码, Bundle对象传递数据
 */
public class mainBundle extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
	}

	// 按钮监听器
	public void onClick(View v) {
		// 意图传递参数
		Intent intent = new Intent();
		intent.setAction("com.example.listenersecondBundle");
		intent.putExtra("str1", "This is a String");
		intent.putExtra("agel", 25);

		// 使用Bundle对象来传递参数
		Bundle bundle = new Bundle();
		bundle.putString("str2", "This is a Bundle");
		bundle.putInt("age2", 35);
		intent.putExtras(bundle);// 将bundle对象放入意图中

		startActivityForResult(intent, 1);// 启动意图返回码为1
	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		// TODO Auto-generated method stub
		super.onActivityResult(requestCode, resultCode, data);
		if (requestCode == 1 && resultCode == RESULT_OK) {
			//字符串
			Toast.makeText(this, Integer.toString(data.getIntExtra("age3", 0)),
					Toast.LENGTH_SHORT).show();
			//数字
	       Toast.makeText(this, data.getData().toString(), Toast.LENGTH_SHORT).show();
		}
	}
}

4,src中创建一个新的class文件 secondBundle

package com.example.listener;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

/**
 * 
 * @author Administrator
 * 
 */
public class secondBundle extends Activity {
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);

		setContentView(R.layout.second);
		Toast.makeText(this, getIntent().getStringExtra("str1"),
				Toast.LENGTH_SHORT).show();

		Toast.makeText(this,
				Integer.toString(getIntent().getIntExtra("age1", 0)),
				Toast.LENGTH_SHORT).show();

		Bundle bundle = getIntent().getExtras();// 意图对象
		
		Toast.makeText(this, bundle.getString("str2"), Toast.LENGTH_SHORT)
				.show();

		Toast.makeText(this, Integer.toString(bundle.getInt("age2")),
				Toast.LENGTH_SHORT).show();

	}

	// 按钮监听器
	public void onClick(View v) {
		Intent intent = new Intent();
		intent.putExtra("age3", 45);
		intent.setData(Uri.parse("返回的值"));
		setResult(RESULT_OK, intent);
		finish();
	}
}

5,在AndroidManifest.xml中添加下面代码;

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.listener"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
    <uses-permission  android:name="android.permission.CALL_PHONE" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.listener.mainBundle"
            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=".secondBundle"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="com.example.listenersecondBundle" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
        
        <!--  
        <activity 
            android:name=".SecondActivity"> 
            <intent-filter>
                <action android:name="com.newer.baihe"/>
                
               <category android:name="android.intent.category.DEFAULT" />
               <category android:name="com.baihe.aaa" />
               <category android:name="com.baihe.bbb" />
               <category android:name="com.baihe.ccc" />
                  
               <data 
                   android:scheme="baihe"
                   android:host="baidu.com"
                   android:path="/index.html"
                   android:mimeType="text/*"
                   />
            </intent-filter>
            </activity> 
            -->
    </application>

</manifest>

6,代码分析;

1), Intent方法添加数据,使用键值对 putExtra()方法

intent.putExtra("str1","This is a String");

intent.putExtra("age1",25);

2),除了使用putExtra()方法,还可以创建一个Bundle对象,并使用putExtras将Bundle对象添加给Intent对象

Bundle bundle = new Bundle();

bundle.putString("str2","This is a Bundle");

bundle.putInt("age2",35);

intent.putExtras(bundle);

3),在活动中,为了获得Intent对象发送的数据,使用getIntent()来获取Intent对象,然后再使用getStringExtra获取发送的字符串,获取int型数据

获取字符串;

Toast.makeText(this,getIntent().getStringExtra("str1"),Toast.LENGTH_SHORT).show();