學習內容來自google教程:http://developer.android.com/intl/zh-cn/training/basics/firstapp/starting-activity.html#DisplayMessage

1 在之前的MainActivity基礎上建立另一個接收訊息的activity:

具體構建很簡單, new->android->Activity, 根據提示建立就行了, 具體參考google教程

2 實現layout

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".DisplayMessageActivity" >

    <TextView
        android:id="@+id/input_message"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true" />

</RelativeLayout>
 

3 繫結按鈕的onclick事件

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button_send" 
        android:onClick="sendMessage"/>

	public void sendMessage(View view) {
		// Do something in response to button
		Intent intent = new Intent(this, DisplayMessageActivity.class);
		EditText editText = (EditText) findViewById(R.id.edit_message);
		String message = editText.getText().toString();
		intent.putExtra(EXTRA_MESSAGE, message);
		startActivity(intent);
	}
 

	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_display_message);
		Intent intent = getIntent();
		String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
		TextView textView = (TextView)findViewById(R.id.input_message);
		textView.setText(message);
		// Show the Up button in the action bar.
		setupActionBar();
	}
 

1 intend要指定接收方activity

2 intend可以看做一個set,儲存鍵值對,用key來儲存和讀取,

3 所有的activity都是被intend喚醒的,所以都可以從喚醒它的intend中獲取資訊.