startActivityForResul完整详解示例

MainActivity如下:

package cc.vv;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;/** * Demo描述: * startActivityForResul使用示例 *  * 利用startActivityForResult跳转到其余Activity * 当第二个Activity关闭时将数据返回给第一个Activity * 在第二个Activity调用finish()或者按下Back键的时候回传数据 *  */public class MainActivity extends Activity {private Button mButton;private int requestCode_test=9527;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);mButton = (Button) findViewById(R.id.button);mButton.setOnClickListener(new ButtonOnClickListener());}/** * 利用startActivityForResult()的方式打开一个新的Activity *  * 注意:startActivityForResult(intent,requestCode)方法的参数 * requestCode表示本次startActivityForResult()操作的请求码 * 因为在同一个Activity中根据业务的不同,可能需要在多处 * 调用startActivityForResult()方法.所以为了区分每次 * startActivityForResult()的操作为其设置一个requestCode */private class ButtonOnClickListener implements OnClickListener {public void onClick(View v) {Intent intent = new Intent();intent.setClass(getApplicationContext(), AnotherActivity.class);startActivityForResult(intent, requestCode_test);}}/** * 利用onActivityResult()处理新Activity关闭时的回传数据 *  * 注意:onActivityResult(int requestCode,int resultCode,Intent data)方法的参数 * 1 requestCode如上描述,区分了不同的startActivityForResult()调用 * 2 resultCode表示新Activity中处理结果的状态. *   比如某项操作是否成功,是否有异常等 * 3 data新Activity回传的数据 */@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if (requestCode==requestCode_test) {if (resultCode==RESULT_OK) {System.out.println("requestCode="+requestCode+",resultCode="+resultCode);String name = data.getStringExtra("name");int age = data.getIntExtra("age", 0);System.out.println("回传参数:name="+name+",age="+age);}}}}

AnotherActivity如下:

package cc.vv;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;/** * 当该Activity调用finish()或按下Back键时利用setResult()回传数据 */public class AnotherActivity extends Activity {private Button mButton;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.another);        mButton=(Button) findViewById(R.id.closeButton);        mButton.setOnClickListener(new ButtonOnClickListenerImpl());}private class ButtonOnClickListenerImpl implements OnClickListener{@Overridepublic void onClick(View v) {setResultData();finish();}}/** * 注意: * onBackPressed()在源码中会调用到finish()方法. * 所以将setResultData()置于super.onBackPressed()之前 */@Overridepublic void onBackPressed() {setResultData();super.onBackPressed();}private void setResultData(){Intent intent=new Intent();intent.putExtra("name", "喜羊羊");intent.putExtra("age", 2);setResult(RESULT_OK, intent);}}

main.xml如下:

<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"    tools:context=".MainActivity" >    <TextView         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:text="@string/mainActivity_tip"         android:textSize="25sp"        />    <Button        android:id="@+id/button"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true"        android:text="@string/button_tip"         android:textSize="25sp"/></RelativeLayout>

another.xml如下:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent" >        <TextView        android:layout_width="200dip"       android:layout_height="50dip"       android:layout_centerHorizontal="true"       android:layout_marginTop="50dip"       android:gravity="center"       android:text="@string/anotherActivity_tip"       />             <Button       android:id="@+id/closeButton"       android:layout_width="150dip"       android:layout_height="50dip"       android:layout_centerInParent="true"       android:layout_marginTop="50dip"       android:gravity="center"       android:text="@string/closeActivity"       /></RelativeLayout>

strings.xml如下:

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">TestActivity3</string>    <string name="action_settings">Settings</string>    <string name="hello_world">Hello world!</string>    <string name="button_tip">跳转到下一个Activity</string>    <string name="mainActivity_tip">测试startActivityForResult</string>    <string name="anotherActivity_tip">这是第二个Activity</string>    <string name="closeActivity">关闭该Activity</string>    </resources>