关于toast的使用方法总结，程序同一时刻只有一个toast，和toast的样式设置。

import android.content.Context;
import android.widget.Toast;

/**
* 只会显示一个toast
* @author xfchen
*
*/
public class ToastAlone extends Toast {
Context context;
/**
* 唯一的toast
*/
private static Toast mToast = null;
public ToastAlone(Context context) {
super(context);
this.context=context;
}

/**
* 显示的可以及时清除
* @param ctx
* @param tips
* @param lastTime
* @return
*/
public static Toast showToast(Context ctx, int stringid, int lastTime) {
if (mToast != null) {
//mToast.cancel();
} else {
mToast = Toast.makeText(ctx, stringid, lastTime);
}
mToast.setText(stringid);
mToast.show();
return mToast;
}

/**
* 显示的可以及时清除
* @param ctx
* @param tips
* @param lastTime
* @return
*/
public static Toast showToast(Context ctx, String tips, int lastTime) {
if (mToast != null) {
//mToast.cancel();
} else {
mToast = Toast.makeText(ctx, tips, Toast.LENGTH_SHORT);
}
mToast.setText(tips);
mToast.show();
return mToast;
}
/**
* 显示的可以及时清除
* @param ctx
* @param tips
* @param lastTime
* @return
*/
public static Toast showToast(Context ctx, String tips) {
if (mToast != null) {
//mToast.cancel();
} else {
mToast = Toast.makeText(ctx, tips, Toast.LENGTH_SHORT);
}
mToast.setText(tips);
mToast.show();
return mToast;
}

}

private void midToast(String str, int showTime)
{
Toast toast = Toast.makeText(MainActivity.this, str, showTime);
toast.setGravity(Gravity.CENTER_VERTICAL|Gravity.CENTER_HORIZONTAL , 0, 0);  //设置显示位置
TextView v = (TextView) toast.getView().findViewById(android.R.id.message);
v.setTextColor(Color.YELLOW);     //设置字体颜色
toast.show();
}

private void customToast(String str, int showTime) {
LayoutInflater inflater = getLayoutInflater();
View view = inflater.inflate(R.layout.view_toast_custom,
(ViewGroup) findViewById(R.id.lly_toast));
ImageView img_logo = (ImageView) view.findViewById(R.id.img_logo);
TextView tv_msg = (TextView) view.findViewById(R.id.tv_msg);
tv_msg.setText(str);
Toast toast = new Toast(mContext);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.setDuration(Toast.LENGTH_LONG);
toast.setView(view);
toast.show();
}