Android新手入門教程（十一）：使用Intents鏈接Activitiesの傳遞數據 – Android移動開發技術文章_手機開發 Android移動開發教學課程

除瞭能從一個Activity返回數據結果之外，向一個Activity傳遞數據也是很常用的。

1.新建一個名為PassData的工程。

2.main.xml中的代碼。

[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" >

    <Button
        android:id="@+id/btn_SecondActivity"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:onClick="onClick"
        android:text="Click to go to Second Activity" />

</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> 3.在res/layout文件夾下，創建secondactivity.xml文件。

[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="Welcome to Second Activity" />

    <Button
        android:id="@+id/btn_MainActivity"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:onClick="onClick"
        android:text="Click to return to main activity" />

</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> 4.新建一個Activity子類：SecondActivity.java。

[java] package net.horsttnann.PassingData;

import net.horsttnann.PassingData.R;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

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

        // —get the data passed in using getStringExtra()—
        Toast.makeText(this, getIntent().getStringExtra("str1"),
                Toast.LENGTH_SHORT).show();

        // —get the data passed in using getIntExtra()—
        Toast.makeText(this,
                Integer.toString(getIntent().getIntExtra("age1", 0)),
                Toast.LENGTH_SHORT).show();

        // —get the Bundle object passed in—
        Bundle bundle = getIntent().getExtras();

        // —get the data using the getString()—
        Toast.makeText(this, bundle.getString("str2"), Toast.LENGTH_SHORT)
                .show();

        // —get the data using the getInt() method—
        Toast.makeText(this, Integer.toString(bundle.getInt("age2")),
                Toast.LENGTH_SHORT).show();
    }

    public void onClick(View view) {
        // —use an Intent object to return data—
        Intent i = new Intent();

        // —use the putExtra() method to return some
        // value—
        i.putExtra("age3", 45);

        // —use the setData() method to return some value—
        i.setData(Uri.parse("Something passed back to main activity"));

        // —set the result with OK and the Intent object—
        setResult(RESULT_OK, i);

        // —destroy the current activity—
        finish();
    }
}
package net.horsttnann.PassingData;

import net.horsttnann.PassingData.R;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

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

        // —get the data passed in using getStringExtra()—
        Toast.makeText(this, getIntent().getStringExtra("str1"),
                Toast.LENGTH_SHORT).show();

        // —get the data passed in using getIntExtra()—
        Toast.makeText(this,
                Integer.toString(getIntent().getIntExtra("age1", 0)),
                Toast.LENGTH_SHORT).show();

// —get the Bundle object passed in—
Bundle bundle = getIntent().getExtras();

        // —get the data using the getString()—
        Toast.makeText(this, bundle.getString("str2"), Toast.LENGTH_SHORT)
                .show();

        // —get the data using the getInt() method—
        Toast.makeText(this, Integer.toString(bundle.getInt("age2")),
                Toast.LENGTH_SHORT).show();
    }

    public void onClick(View view) {
        // —use an Intent object to return data—
        Intent i = new Intent();

        // —use the putExtra() method to return some
        // value—
        i.putExtra("age3", 45);

// —use the setData() method to return some value—
i.setData(Uri.parse("Something passed back to main activity"));

// —set the result with OK and the Intent object—
setResult(RESULT_OK, i);

        // —destroy the current activity—
        finish();
    }
}    5.AndroidManifest.xml中的代碼。

[java] <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="net.horsttnann.PassingData"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".PassingDataActivity"
            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="net.horsttnann.PassingData.SecondActivity"
            android:label="Second Activity" >
            <intent-filter>
                <action android:name="net.horsttnann.PassingDataSecondActivity" />

                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>

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

<uses-sdk android:minSdkVersion="10" />

</manifest> 6.PassDataActivity中的代碼。

7.按F11調試。

效果圖：

程序第一次啟動：

跳轉到SecondActivity：

返回PassDataActivity：

摘自 horsttnann的專欄

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