Android 自定义Toast，并且勘误Android工具类里面的ToastUtils

前言

相信大部分仁兄在使用系统Toast的时候，都感觉不太尽如人意，因为系统Toast显示的位置比较固定，并且字体颜色等会跟随系统版本变化，那么能不能自己写一个呢，答案是当然的。当然，这是本文的一个重点，还有一个重点是，要对上一篇Android工具类里面的ToastUtils进行勘误，大概你现在还不太明白，容我慢慢道来，你且看着。

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先上图


自定义的不带图片的Toast（代码里编辑布局）.png

自定义的带图片的Toast.png

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首先

先看toast源码

   public void setText(CharSequence s) {    
    if (mNextView == null) {    
        throw new RuntimeException("This Toast was not created with Toast.makeText()");    
    }    
    TextView tv = (TextView) mNextView.findViewById(com.android.internal.R.id.message);    
    if (tv == null) {    
        throw new RuntimeException("This Toast was not created with Toast.makeText()");    
    }    
    tv.setText(s);    
}  

如果不指定view，则mNextView的值为null。就会抛出异常。另外使用第一种方式时，就算你为Toast设置好了View也不能这样调用：toast.setText(s);
会抛出This Toast was not created with Toast.makeText()异常。解决的办法是定义一个TextView，然后为TextView赋值，再加到XXLayout中，
使用setView(XXLayout)把XXLayout设置成Toast的View。

本人遇到的错误我也一并贴出来
Caused by: java.lang.RuntimeException: This Toast was not created with Toast.makeText()
at android.widget.Toast.setText(Toast.java:275)
at cn.and.ToastActivity.onCreate(ToastActivity.java:20)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)

再看看Android 工具类里面的ToastUtils写法

   public static void showToast(Context context, String message) {
if (toast == null) {
    toast = Toast.makeText(context, message, Toast.LENGTH_SHORT);
} else {
    toast.setText(message);
}
toast.show();
}

虽然平时用着不会报错，但是有的时候还是会报错，为了防患于未然，今天就重新放出自己查阅资料后修改的Toast工具类

其次，请各位看官看Toast工具类

由于代码比较简单，我也就不再一一赘述了，相信各位看官都可以看懂

  public class ToastUtils {
public static final int LENGTH_SHORT = 0;
public static final int LENGTH_LONG = 1;
private static View toastView;
private WindowManager mWindowManager;
private static int mDuration;
private final int WHAT = 100;
private static View oldView;
private static Toast toast;
private static CharSequence oldText;
private static CharSequence currentText;
private static ToastUtils instance = null;
private static TextView textView;
// 是否显示
private static boolean isShow = true;
private static ImageView mImgIcon;
private static TextView mTxtMsg;
private static LinearLayout mLytShow;
   /**
 * 显示消息(这个是把文本颜色和背景色没有提出来的写法)
 * 
 * @param context
 *            上下文
 * @param message
 *            消息内容
 */
public static void showToast(Context context, String message) {
    if (isShow) {
        toast = new Toast(context);
        // 消息内容
        mTxtMsg = new TextView(context);
        LinearLayout.LayoutParams lParams1 = new LinearLayout.LayoutParams(
                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        mTxtMsg.setTextColor(Color.parseColor("#000000"));
        mTxtMsg.setTextSize(DensityUtils.dp2px(context, 12));
        mTxtMsg.setPadding(10, 5, 10, 5);

        mTxtMsg.setLayoutParams(lParams1);

        mLytShow = new LinearLayout(context);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        mLytShow.setOrientation(LinearLayout.HORIZONTAL);
        mLytShow.setLayoutParams(params);

        int roundRadius = 100; // 8dp 圆角半径
        int fillColor = Color.parseColor("#F89009");// 内部填充颜色
        GradientDrawable gd = new GradientDrawable();// 创建drawable
        gd.setCornerRadius(roundRadius);
        gd.setColor(fillColor);

        mLytShow.setBackgroundDrawable(gd);
        mLytShow.addView(mTxtMsg);

        if (message != null) {
            mTxtMsg.setText(message);
        }
        toast.setView(mLytShow);
        toast.setGravity(Gravity.BOTTOM, 0,
                DensityUtils.dp2px(context, 100));
        toast.setDuration(Toast.LENGTH_SHORT);
        toast.show();
    }
}
/**
 * 显示消息（这个是把文本颜色和toast背景颜色提出来的写法）
 * 
 * @param context
 *            上下文
 * @param message
 *            消息内容
 */
public static void showToast(Context context, String message,
        String textColor, String bgColor) {
    if (isShow) {
        toast = new Toast(context);
        // 消息内容
        mTxtMsg = new TextView(context);
        LinearLayout.LayoutParams lParams1 = new LinearLayout.LayoutParams(
                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        mTxtMsg.setTextColor(Color.parseColor(textColor));
        mTxtMsg.setTextSize(DensityUtils.dp2px(context, 12));
        mTxtMsg.setPadding(10, 5, 10, 5);

        mTxtMsg.setLayoutParams(lParams1);

        mLytShow = new LinearLayout(context);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        mLytShow.setOrientation(LinearLayout.HORIZONTAL);
        mLytShow.setLayoutParams(params);

        int roundRadius = 100; // 8dp 圆角半径
        int fillColor = Color.parseColor(bgColor);// 内部填充颜色
        GradientDrawable gd = new GradientDrawable();// 创建drawable
        gd.setCornerRadius(roundRadius);
        gd.setColor(fillColor);

        mLytShow.setBackgroundDrawable(gd);
        mLytShow.addView(mTxtMsg);

        if (message != null) {
            mTxtMsg.setText(message);
        }
        toast.setView(mLytShow);
        toast.setGravity(Gravity.BOTTOM, 0,
                DensityUtils.dp2px(context, 100));
        toast.setDuration(Toast.LENGTH_SHORT);
        toast.show();
    }
}

/**
 * 显示Toast
 * 
 * @param context
 *            上下文
 * @param message
 *            信息内容
 */
public static void showIconToast(Context context, String message, int resId) {
    if (isShow) {
        toast = new Toast(context);
        LayoutInflater inflater = LayoutInflater.from(context);
        View view = inflater.inflate(R.layout.mtoast_layout, null);
        TextView tv = (TextView) view.findViewById(R.id.toast_tv);
        ImageView mImgShow = (ImageView) view.findViewById(R.id.img_toast);
        if (message != null) {
            tv.setText(message);
        }
        mImgShow.setImageResource(resId);
        toast.setView(view);
        toast.setDuration(Toast.LENGTH_SHORT);
        toast.show();
    }
}

/**
 * 显示消息内容（带图标）
 * 
 * @param context
 *            上下文
 * @param message
 *            消息内容
 * @param resId
 *            图片资源id
 * @param textColor
 *            文本颜色
 * @param textSize
 *            文本大小
 * @param bgColor
 *            背景颜色
 */
public static void showIconToastMessage(Context context, String message,
        int resId, String textColor, float textSize, String bgColor) {
    if (isShow) {
        toast = new Toast(context);
        // 图片
        mImgIcon = new ImageView(context);
        LinearLayout.LayoutParams lParams = new LinearLayout.LayoutParams(
                DensityUtils.dp2px(context, 48), DensityUtils.dp2px(
                        context, 48));
        mImgIcon.setImageResource(resId);
        lParams.gravity = Gravity.CENTER_HORIZONTAL
                | Gravity.CENTER_VERTICAL;
        lParams.setMargins(5, 5, 5, 5);
        mImgIcon.setLayoutParams(lParams);

        // 消息内容
        mTxtMsg = new TextView(context);
        LinearLayout.LayoutParams lParams1 = new LinearLayout.LayoutParams(
                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
        mTxtMsg.setTextColor(Color.parseColor(textColor));
        mTxtMsg.setTextSize(DensityUtils.dp2px(context, textSize));
        mTxtMsg.setLayoutParams(lParams1);

        mLytShow = new LinearLayout(context);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        mLytShow.setOrientation(LinearLayout.HORIZONTAL);
        mLytShow.setLayoutParams(params);

        int roundRadius = 100; // 8dp 圆角半径
        // int strokeColor = Color.parseColor("#2E3135");// 边框颜色
        int fillColor = Color.parseColor(bgColor);// 内部填充颜色
        GradientDrawable gd = new GradientDrawable();// 创建drawable
        gd.setColor(fillColor);
        gd.setCornerRadius(roundRadius);
        // gd.setStroke(0, strokeColor);

        mLytShow.setBackgroundDrawable(gd);
        mLytShow.addView(mImgIcon);
        mLytShow.addView(mTxtMsg);

        if (message != null) {
            mTxtMsg.setText(message);
        }
        toast.setView(mLytShow);
        toast.setGravity(Gravity.CENTER, 0, 0);
        toast.setDuration(Toast.LENGTH_SHORT);
        toast.show();
    }
}
}

再次，资源文件，我也一并贴出来吧

比较简单，就一个ImageView和一个textview

最后

感谢 qiushyfm
Jlanglang

也欢迎大家关注我的Silence潇湘夜雨 和 githubSilence潇湘夜雨
小可不才，如果什么地方写的不对，还请指正。