两个Activity通过Intent传递数据

[url]http://blog.youkuaiyun.com/hongshan50/article/details/6585396[/url]
这里有一份很好的文章:
[url]http://www.cnblogs.com/feisky/archive/2010/01/16/1649081.html
[/url]
[b]1.无参数Activity跳转[/b]

Intent it = new Intent(Activity.Main.this, Activity2.class);
startActivity(it);  

[b]2.向下一个Activity传递数据（使用Bundle和Intent.putExtras）[/b]
Intent it = new Intent(Activity.Main.this, Activity2.class);

Bundle bundle=new Bundle();
bundle.putString("name", "This is from MainActivity!");
it.putExtras(bundle);       // it.putExtra(“test”, "shuju”);
startActivity(it);            // startActivityForResult(it,REQUEST_CODE);

对于数据的获取可以采用：

Bundle bundle=getIntent().getExtras();
String name=bundle.getString("name");

或者：

                Intent intent = getIntent();
                intent.setClass(MyActivity.this,ForwardTarget.class);
                intent.putExtra("param1","Pandy");
                intent.putExtra("param2","GuiZhou");
                startActivityForResult(intent, GET_CODE);

//获取参数，并显示。
        Intent intent = getIntent();
        String param1 = intent.getStringExtra("param1");
        String param2 = intent.getStringExtra("param2");

[b]3.向上一个Activity返回结果（使用setResult，针对[/b]

startActivityForResult(it,REQUEST_CODE)启动的Activity）
        Intent intent=getIntent();
        Bundle bundle2=new Bundle();
        bundle2.putString("name", "This is from ShowMsg!");
        intent.putExtras(bundle2);
        setResult(RESULT_OK, intent);

[b]4.回调上一个Activity的结果处理函数（onActivityResult）[/b]

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode==REQUEST_CODE){
            if(resultCode==RESULT_CANCELED)
                  setTitle("cancle");
            else if (resultCode==RESULT_OK) {
                 String temp=null;
                 Bundle bundle=data.getExtras();
                 if(bundle!=null)   temp=bundle.getString("name");
                 setTitle(temp);
            }
        }
    }

[color=red][b]注意：[/b][/color]
总结：调用startActivityForResult，onActivityResult无响应的问题 [url]http://blog.sina.com.cn/s/blog_5da93c8f0101gzf5.html[/url]
我碰到问题跟这里的不一样，就是在接受返回参数的Activity里面的一些方法，使用了getIntent()来得到Intent,导致还没运行返回参素好的Activity,就已经调用了onActivityResult();
[color=red]最好不要在非onCreate()方法外使用getIntent()来获取Intent[/color];


[color=red]我的例子源码：[/color]
main.xml
----------------------------------------------

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/factorone"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/symbol"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/symbol" />

    <EditText
        android:id="@+id/factortwo"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/calculate"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/calculate" />

</LinearLayout>

result.xml
----------------------------------------------

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/totalRsult"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/symbol" />

</LinearLayout>

strings.xml
----------------------------------------------

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="hello">Hello World, Android_TwoActivityActivity!</string>
    <string name="app_name">Android_TwoActivity</string>
    <string name="firstActivity">第一个Activity</string>
    <string name="secondActivity">第二个Activity</string>
    <string name="symbol">乘以</string>
    <string name="calculate">计算</string>

</resources>

FirstActivity.java
----------------------------------------------

package com.pandy.test;

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.TextView;

public class FirstActivity extends Activity {
	private EditText factorOne;
	private EditText factorTwo;
	private TextView symbol;
	private Button calculate;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		factorOne = (EditText) findViewById(R.id.factorone);
		factorTwo = (EditText) findViewById(R.id.factortwo);
		symbol = (TextView) findViewById(R.id.symbol);
		calculate = (Button) findViewById(R.id.calculate);
		calculate.setOnClickListener(new MyListener());
	}

	class MyListener implements OnClickListener {
		@Override
		public void onClick(View arg0) {
			Intent intent = new Intent();
			intent.setClass(FirstActivity.this, SecondActivity.class);
			intent.putExtra("factorOneStr", factorOne.getText().toString());
			intent.putExtra("factorTwoStr", factorTwo.getText().toString());

			startActivity(intent);
		}

	}
}

SecondActivity.java
----------------------------------------------

package com.pandy.test;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class SecondActivity extends Activity {
	private TextView resultView;

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

		resultView = (TextView) findViewById(R.id.totalRsult);

		Intent intent = getIntent();

		String factorOneStr = intent.getStringExtra("factorOneStr");
		String factorTwoStr = intent.getStringExtra("factorTwoStr");

		int factorOneInt = Integer.parseInt(factorOneStr);
		int factorTwoInt = Integer.parseInt(factorTwoStr);

		resultView.setText(factorOneInt * factorTwoInt + "");
	}
}

R.java
----------------------------------------------

/* AUTO-GENERATED FILE.  DO NOT MODIFY.
 *
 * This class was automatically generated by the
 * aapt tool from the resource data it found.  It
 * should not be modified by hand.
 */

package com.pandy.test;

public final class R {
    public static final class attr {
    }
    public static final class drawable {
        public static final int ic_launcher=0x7f020000;
    }
    public static final class id {
        public static final int calculate=0x7f050003;
        public static final int factorone=0x7f050000;
        public static final int factortwo=0x7f050002;
        public static final int symbol=0x7f050001;
        public static final int totalRsult=0x7f050004;
    }
    public static final class layout {
        public static final int main=0x7f030000;
        public static final int result=0x7f030001;
    }
    public static final class string {
        public static final int app_name=0x7f040001;
        public static final int calculate=0x7f040005;
        public static final int firstActivity=0x7f040002;
        public static final int hello=0x7f040000;
        public static final int secondActivity=0x7f040003;
        public static final int symbol=0x7f040004;
    }
}

AndroidManifest.xml
----------------------------------------------

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.pandy.test"
    android:versionCode="1"
    android:versionName="1.0" >

    <application
        android:label="@string/app_name" >
        <activity
            android:name=".FirstActivity"
            android:label="@string/firstActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".SecondActivity"
            android:label="@string/secondActivity" />
    </application>

    <uses-sdk android:minSdkVersion="4" />

</manifest>