Android新手入门教程（十）：使用Intents链接Activitiesの返回结果

startActivity()方法可以调用另外的Activity，但这种方法不会给当前的Activity返回一个结果。例如，你有一个Activity提示用户输入用户名和密码，用户输入的信息需要被“回传”给这个输入信息的Activity，那就需要使用startActivityForResult()方法。

1.secondactivity.xml中的代码。

[java] <?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:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="This is the Second Activity!" />

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Please enter your name" />

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

    <Button
        android:id="@+id/btn_OK"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:onClick="onClick"
        android:text="OK" />

</LinearLayout>
<?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" >

</LinearLayout> 2.SecondActivity.java中的代码。

[java] package net.horsttnann.UsingIntent;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class SecondActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.secondactivity);
    }

    public void onClick(View view) {
        Intent data = new Intent();

        // ---get the EditText view---
        EditText txt_username = (EditText) findViewById(R.id.txt_username);

        // ---set the data to pass back---
        data.setData(Uri.parse(txt_username.getText().toString()));
        setResult(RESULT_OK, data);

        // ---closes the activity---
        finish();
    }
}
package net.horsttnann.UsingIntent;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class SecondActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.secondactivity);
    }

public void onClick(View view) {
Intent data = new Intent();

// ---get the EditText view---
EditText txt_username = (EditText) findViewById(R.id.txt_username);

        // ---set the data to pass back---
        data.setData(Uri.parse(txt_username.getText().toString()));
        setResult(RESULT_OK, data);

        // ---closes the activity---
        finish();
    }
}
    3.UsingIntentActivity.java中的代码。

[java] package net.horsttnann.UsingIntent;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class UsingIntentActivity extends Activity {
    int request_Code = 1;

    /** Called when the activity is first created. */
    @Override&nb

补充：移动开发 , Android ,