获取屏幕尺寸

//引用包
var Dimensions = require('Dimensions');
class DimensionsDemo extends Component {

render() {
return(
<View style = {dimentsionsStyle.dimensionStyle}>
{/*通过一个key*/}
<Text>当前屏幕宽度:{Dimensions.get('window').width}</Text>
<Text>当前屏幕高度:{Dimensions.get('window').height}</Text>
<Text>点钱屏幕分辨率:{Dimensions.get('window').scale}</Text>

</View>
);
}

}

const dimentsionsStyle = StyleSheet.create({
dimensionStyle: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
},
});