android开发_Intent_requestCode_resultCode页面之间的跳转

新建项目：

项目结构：

运行效果：

回到MainActivity类

代码部分：

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <TextView  
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="请输入:"
        />
     <EditText
         android:id="@+id/et_input"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:hint="内容"
     ></EditText>
     <Button
         android:id="@+id/btn_send"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:text="跳转"
     ></Button>
</LinearLayout>

MainActivity.java

package com.b510;

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;
import android.widget.Toast;

public class MainActivity extends Activity {
    /** 定义一个输入框 */
    private EditText et_input;
    /** 定义一个按钮 */
    private Button btn_send;
    /** 定义一个requestCode为0 */
    private final static int REQUEST_CODE = 0;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        et_input = (EditText) findViewById(R.id.et_input);
        btn_send = (Button) findViewById(R.id.btn_send);
        btn_send.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,
                        ReceiveAcitivity.class);
                // 把et_input输入框中的信息设置在参数msg中
                intent.putExtra("msg", et_input.getText().toString());
                // 执行跳转
                startActivityForResult(intent, REQUEST_CODE);
            }
        });
    }

    /**
     * 当从其他页面返回来的时候，会调用此方法
     */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == REQUEST_CODE) {
            if (resultCode == ReceiveAcitivity.RUSULT_CODE_1) {
                Toast.makeText(MainActivity.this, "这是从ReceiveActivity类回来的响应",
                        Toast.LENGTH_LONG).show();
            }
        }
    }
}

receive.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <TextView  
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="你输入的是:"
        />
     <TextView  
         android:id="@+id/tv_receive"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        />
     
     <Button
         android:id="@+id/btn_return"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:text="返回"
     ></Button>
</LinearLayout>

ReceiveActivity.java

package com.b510;

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.TextView;

/**
 * @author Hongten
 * 
 */
public class ReceiveAcitivity extends Activity {

    /** 定义一个resultCode=1 */
    public final static int RUSULT_CODE_1 = 1;
    /** 定义一个接受消息的TextView */
    private TextView tv_receive;
    /** 定义一个返回按钮 */
    private Button btn_return;
    /** 定义一个Intent对象 */
    Intent intent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.receive);

        tv_receive = (TextView) findViewById(R.id.tv_receive);
        btn_return = (Button) findViewById(R.id.btn_return);
        intent = getIntent();
        // 接收从MainActivity类传递过来的信息msg
        String msg = intent.getStringExtra("msg");
        // 设置tv_receive的值为msg
        tv_receive.setText(msg);
        // 当点击返回按钮的时候，返回到MainActivity类
        btn_return.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                setResult(RUSULT_CODE_1);
                finish();// finish本Activity
            }
        });
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.b510"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="9" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".MainActivity"
                  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=".ReceiveAcitivity"
                  android:label="@string/app_name">
        </activity>
    </application>
</manifest>