自定义Toast，兼容那些安装时把通知关掉还问为啥不给提示的测试人员

public class MyToast{

    long mDurationMillis;
    private Context mContext;
    Dialog builder;
    Handler ha=new Handler();
    View view;


    public static MyToast makeText(Context context, String text, long duration) {

        return new MyToast(context,text,duration);
    }

    public MyToast(Context context,String text,long duration) {
        view = Toast.makeText(context.getApplicationContext(), text, Toast.LENGTH_SHORT).getView();
        if (view != null) {
            TextView tv = (TextView) view.findViewById(android.R.id.message);
            tv.setText(text);
        }
        setDuration(duration);
        builder=new Dialog(context,R.style.Toast);  //先得到构造器
        ViewGroup.LayoutParams params = new ViewGroup.LayoutParams( ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT );
        builder.addContentView(view,params);
        Window window = builder.getWindow();
        // 可以在此设置显示动画
        WindowManager.LayoutParams wl = window.getAttributes();
        wl.y = ((Activity)context).getWindowManager().getDefaultDisplay().getHeight()/5;
        // 以下这两句是为了保证按钮可以水平满屏
        wl.width = ViewGroup.LayoutParams.WRAP_CONTENT;
        wl.height = ViewGroup.LayoutParams.WRAP_CONTENT;
        // 设置显示位置
        builder.onWindowAttributesChanged(wl);
    }

    /**
     * Set the location at which the notification should appear on the screen.
     *
     */

    public MyToast setDuration(long durationMillis) {

        if (durationMillis < 0) {
            mDurationMillis = 0;
        }
        if (durationMillis == Toast.LENGTH_SHORT) {
            mDurationMillis = 2000;
        } else if (durationMillis == Toast.LENGTH_LONG) {
            mDurationMillis = 3500;
        } else {
            mDurationMillis = durationMillis;
        }
        return this;
    }

    public void show() {
        builder.show();
        ha.postDelayed(new Runnable() {
            @Override
            public void run() {
                if(builder.isShowing()) {
                    try {
                        builder.cancel();
                    }catch (IllegalArgumentException e){

                    }
                }
            }
        }, mDurationMillis);
    }

    public void setText(String text) {
        TextView tv = (TextView) view.findViewById(android.R.id.message);
        tv.setText(text);
    }
}