用ApplicationContext在Activity与Activity其间传值

用ApplicationContext在Activity与Activity之间传值

　　android:label="@string/app_name">

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class?Blah?extends?Activity?{????Override??　public?void?onCreate(Bundle?b){??　...??　MyApp?appState?=?((MyApp)getApplicationContext());??　String?state?=?appState.getState();??　...??　}??　}?