Android 页面跳转传递参数及页面返回接收参数

HelloWorldActivity.java
package syit.david;

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.Toast;

public class HelloWorldActivity extends Activity
{
private Button btn;
public final static int REQUEST_CODE = 1;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn = (Button) findViewById(R.id.btn1);
btn.setOnClickListener(listener);

}

private OnClickListener listener = new OnClickListener()
{

public void onClick(View v)
{
Intent intent = new Intent();
intent.setClass(HelloWorldActivity.this, SecondActivity.class);
intent.putExtra("str", "First Android Application!");
//startActivity(intent);
startActivityForResult(intent, REQUEST_CODE);
}
};

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
if(requestCode==REQUEST_CODE)
{
if(resultCode==SecondActivity.RESULT_CODE)
{
Bundle bundle = data.getExtras();
String str = bundle.getString("back");
Toast.makeText(HelloWorldActivity.this, str, Toast.LENGTH_LONG).show();
}
}
}

}



SecondActivity.java

package syit.david;

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;

public class SecondActivity extends Activity
{
private TextView tv;
private Button btn;
public final static int RESULT_CODE = 1;
@Override
protected void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
tv = (TextView)findViewById(R.id.secondText);

Intent intent = getIntent();
Bundle bundle = intent.getExtras();
String s = bundle.getString("str");
tv.setText(s);

btn = (Button)findViewById(R.id.btn2);
btn.setOnClickListener(listener);
}

public OnClickListener listener = new OnClickListener()
{
public void onClick(View v)
{
Intent intent = new Intent();
intent.putExtra("back", "Back Data");
setResult(RESULT_CODE, intent);
finish();
}
};

}



layout目录下的2个xml文件main和second
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" >

<TextView
android:id="@+id/firstText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<Button
android:id="@+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btnText1"
/>
</LinearLayout>
second.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/secondText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<Button
android:id="@+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/btnText2"
/>
</LinearLayout>

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

<uses-sdk android:minSdkVersion="15" />

<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".HelloWorldActivity"
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=".SecondActivity"
android:label="@string/app_name">
</activity>
</application>
<uses-permission android:name="android.permission.CALL_PHONE"/>
<uses-permission android:name="android.permission.SEND_SMS"/>
</manifest>

注意点：
1、新建一个Android的Activity后，都需要在AndroidManifest.xml文件中进行注册声明。

2、页面传递参数使用 startActivityForResult()方法，并实写其
onActivityResult()方法，在方法里进行判断处理。

3、接收页面使用setResult()方法，将值返回。