Android的startActivityForResult用法简单介绍

来源：互联网发布：模拟退火算法 c语言编辑：程序博客网时间：2024/06/03 00:02

转载注明出处：http://blog.csdn.net/loveyaozu/article/details/51881401

Activity的跳转方式有两种，一种是startActivity直接跳转，另一种是startActivityForResult，带有数据回传的跳转。

新建一个FirstActivity类

package com.example.androidtest1;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.text.TextUtils;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;/** * @author syz * @date 2016-7-11 */public class FirstAcivity extends Activity {// 请求码public static final int REQUEST_CODE = 0X100;public static final String CONTENT="content";private TextView resultTv;private Button btCommit;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_first);resultTv = (TextView) findViewById(R.id.content);btCommit = (Button) findViewById(R.id.go_second);btCommit.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent(FirstAcivity.this,SecondActivity.class);FirstAcivity.this.startActivityForResult(intent, REQUEST_CODE);}});}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if(requestCode == REQUEST_CODE){if(resultCode == RESULT_OK){String text = data.getStringExtra(CONTENT);if(!TextUtils.isEmpty(text)){resultTv.setText(text);}else{resultTv.setText("来自SecondActivity的CONTENT值为空");}}}else{}}}

对应布局activity_first.xml

<?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:id="@+id/content"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="30dp"        android:gravity="center"        android:layout_gravity="center"/>        <Button         android:id="@+id/go_second"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="30dp"        android:text="跳转到SecondActivity"/></LinearLayout>

另一个Activity类SecondActivity。设置数据并回传给FirstActivity

package com.example.androidtest1;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;import android.widget.EditText;/** * @author syz * @date 2016-7-11 */public class SecondActivity extends Activity {private Button mbutton;private EditText editText;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_second);mbutton = (Button) findViewById(R.id.commit);editText = (EditText) findViewById(R.id.content);mbutton.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {String content = editText.getText().toString();Intent data = new Intent();data.putExtra(FirstAcivity.CONTENT, content);SecondActivity.this.setResult(RESULT_OK, data);finish();}});}}

与之对应的布局文件activity_second.xml。主要是一个输入框和一个Button，输入框中输入的内容传递给FirstActivity。Button用于finish页面。

<?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" >    <EditText        android:id="@+id/content"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:layout_marginTop="30dp" />    <Button        android:id="@+id/commit"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:layout_marginTop="30dp"        android:text="提交" /></LinearLayout>

效果展示

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