startActivityForResult的用法（Android）

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1、第一个页面的activity.java

package cn.buaa.z1;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.EditText;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void open(View view) {        Intent intent = new Intent("sec");        startActivityForResult(intent,1);    }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        super.onActivityResult(requestCode, resultCode, data);        if(requestCode ==1 && resultCode == 1){           String msg = data.getStringExtra("msg");           EditText et = (EditText)findViewById(R.id.et1);           et.setText(msg);        }    }}

2、第二个页面的activity.java

package cn.buaa.z1;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.EditText;public class Main2Activity extends AppCompatActivity {    private EditText et ;    @Override    protected void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);            setContentView(R.layout.activity_main2);    }    public void retu(View view) {       et=(EditText)findViewById(R.id.et2);        Intent intent = this.getIntent();        intent.putExtra("msg",et.getText().toString());        setResult(1,intent);        finish();    }}

3、第一个页面layout

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="cn.buaa.z1.MainActivity" android:orientation="vertical">    <EditText        android:id="@+id/et1"        android:layout_width="match_parent"        android:layout_height="wrap_content"/>       <Button           android:layout_width="match_parent"           android:layout_height="wrap_content" android:text="open"           android:onClick="open"/></LinearLayout>

4、第二个页面layout

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="cn.buaa.z1.Main2Activity" android:orientation="vertical">    <EditText        android:id="@+id/et2"        android:layout_width="match_parent"        android:layout_height="wrap_content"/>    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content" android:text="return"        android:onClick="retu"/></LinearLayout>

5、xml配置

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="cn.buaa.z1">    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity android:name=".MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity android:name=".Main2Activity">            <intent-filter>                <action android:name="sec"></action>                <category android:name="android.intent.category.DEFAULT"/>            </intent-filter>        </activity>    </application></manifest>

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