安卓通过全局的Applaction获取到Context

public class IMApplication extends Application {
    private static Context mContext;

    @Override
    public void onCreate() {
        super.onCreate();

    // 初始化全局上下文对象
        mContext = this;
    }

    // 获取全局上下文对象
    public static Context getGlobalApplication(){
        return mContext;
    }
}