Intent也可称为一个在不同组件之间传递的消息,这个消息在到达接收组件后,接收组件会执行相关的动作
与显式启动不同的是:
显示启动直接创建对象跳转指定Activity对象,如:
Intent intent = new Intent(MainActivity.this, SecondActivity.class);
startActivity(intent);
隐式启动则是, Android系统根据Intent的动作和数据来决定启动哪一个Activity。
也就是说在隐式启动时,Intent中只包含需要执行的动作和所包含的数据,而无需指明具体启动哪一个Activity,选择权有Android系统和最终用户来决定
如:<activity
android:name=".AnotherActivity"
android:label="@string/title_activity_another" >
<intent-filter>
<action android:name=“startAnotherActivity"/> -----手动加粗
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
Intent intent=new Intent();
intent.setAction("startAnotherActivity"); -----手动加粗
startActivity(intent);
这是最简单的页面跳转,但一般视觉看不出来与显式启动的区别。
隐式启动还可以这样:
---打开特定网页
Intent intent= new Intent(Intent.ACTION_VIEW); //Action属性
intent.setData(Uri.parse("http://www.baidu.com")); //Data属性
startActivity(intent);
<activity android:name=".Internet">
<intent-filter>
<action android:name="startWord" />
<category android:name="android.intent.category.DEFAULT" />
<data android:scheme="http" /> <!-- 响应所有http协议的Internet-->
</intent-filter>
</activity>
---拨打电话
Intent intent= new Intent(Intent.ACTION_DIAL);
intent.setData(Uri.parse("tel:10086"));
startActivity(intent);
关于隐式启动还有很多的组合功能能实现:有兴趣或者有需求的盆友们可以搜索常见的Action,Data组合情况等等。
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