Android全局變量使用

1、通過一個Data.java實例類，可以實現全局數據保存，這裡就不多說了，學Java的都知道。

2、Android特有的Application，是應用的入口，運行貫穿整個app運行過程，可以在這個類中定義全局變量

public class baseApplication extends Application {
		
	private float screenWidth;
	private float screenHeight;
	
	
	public float getScreenWidth() {
		return screenWidth;
	}
	public void setScreenWidth(float screenWidth) {
		this.screenWidth = screenWidth;
	}
	public float getScreenHeight() {
		return screenHeight;
	}
	public void setScreenHeight(float screenHeight) {
		this.screenHeight = screenHeight;
	}
	
	
}

        
        baseApplication b=(baseApplication) getApplicationContext();
        float width=b.getScreenWidth();
        float height=b.getScreenHeight();