学习日记--测试startActivityForResult

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一、startActivityForResult的运作模型

二、Java代码

<pre name="code" class="java">package com.hxzy.activityresult;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Button start = (Button) findViewById(R.id.startActivity);start.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(MainActivity.this, ActivityB.class);int arr[] = new int[2];arr[0] = 1;arr[1] = 1;intent.putExtra(Constants.KEY_MAINACTIVITY, arr);startActivityForResult(intent, Constants.request_code);}});}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {if (10 == Constants.request_code && 11 == Constants.result_code) {int result = Integer.parseInt(data.getStringExtra(Constants.KEY_ACTIVITYB));Log.d(this.getClass().getName() + " onActivityResult,运算结果为:", result + "");}}}

2、ActivityB

package com.hxzy.activityresult;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class ActivityB extends Activity {protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_b);Intent intent = getIntent();int[] arr = intent.getIntArrayExtra(Constants.KEY_MAINACTIVITY);final int sum = arr[0] + arr[1];Button butto_Return = (Button) findViewById(R.id.returnActivity);butto_Return.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(ActivityB.this, MainActivity.class);intent.putExtra(Constants.KEY_ACTIVITYB, sum + "");ActivityB.this.setResult(Constants.result_code, intent);ActivityB.this.finish();}});}}

3、Constants（存放静态变量）

package com.hxzy.activityresult;public class Constants {public static final String KEY_MAINACTIVITY="key";public static final String KEY_ACTIVITYB="key";public static final int request_code=10;public static final int result_code=11;}

三、layout布局文件

1、activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.hxzy.activityresult.MainActivity" >    <Button        android:id="@+id/startActivity"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:layout_centerVertical="true"        android:text="启动ActivityB" /></RelativeLayout>

2、activity_b.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.hxzy.activityresult.MainActivity" >    <Button        android:id="@+id/returnActivity"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:layout_centerVertical="true"        android:text="返回MainActivity" /></RelativeLayout>

四、AndroidManifest.xml

在AndroidManifest.xml中添加ActivityB。

         <activity            android:name=".ActivityB"            android:label="B" >        </activity>

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