Android 程式开发：（二）使用意图 —— 2.4 使用Intent传递数据

除了能从一个Activity返回数据结果之外，向一个Activity传递数据也是很常用的。
    1.新建一个名为PassData的工程。

    2.main.xml中的代码。

[java] view plaincopy<?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>
    3.在res/layout文件夹下，创建secondactivity.xml文件。[java] view plaincopy<?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>
    4.新建一个Activity子类：SecondActivity.java。[java] view plaincopypublic 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中的代码。[java] view plaincopy<?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&g

补充：移动开发 , Android ,