大家都知道，Android的控件有時候很難滿足我們的需求，所以我們需要自定義View。自定義的方式很多，有繼承原生控件也有直接自定義View的，今天寫的是自定義的Toast，當然，這個不是復寫Toast,是換一種表達形式，哈哈，后續會增加自定義View的方方面面

先來看看效果圖吧

是不是挺好看的，如果你看過Toast的源碼就會知道，他主要是用了WindowManager，我們也直接來寫一個

TabToast

package com.lgl.toast;import android.content.Context;import android.text.TextUtils;import android.util.DisplayMetrics;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.view.WindowManager;import android.widget.LinearLayout;import android.widget.TextView;import android.widget.Toast;public class TabToast {/** * Toast字體大小 */private static final float DEFAULT_TEXT_SIZE = 14;/** * Toast字體顏色 */private static final int DEFAULT_TEXT_COLOR = 0xffffffff;/** * Toast背景顏色 */private static final int DEFAULT_BG_COLOR = 0xE6f5695a;/** * Toast的高度(單位dp) */private static final float DEFAULT_TOAST_HEIGHT = 50.0f;private static Context mContext;private volatile static TabToast mInstance;private static Toast mToast;private View layout;private TextView tv;public TabToast(Context context) {mContext = context;}/** * 單例模式 * * @param context * 傳入的上下文 * @return TabToast實例 */private static TabToast getInstance(Context context) {if (mInstance == null) {synchronized (TabToast.class) {if (mInstance == null) {mInstance = new TabToast(context.getApplicationContext());}}}return mInstance;}private static void getToast(int duration) {//設置位置int gravity, int xOffset, int yOffsetif (mToast == null) {mToast = new Toast(mContext);mToast.setGravity(Gravity.BOTTOM, 0, 0);//設置顯示時間mToast.setDuration(duration == Toast.LENGTH_LONG ? Toast.LENGTH_LONG: Toast.LENGTH_SHORT);}}public static void makeText(Context context, String text) {makeText(context, text, Toast.LENGTH_SHORT);}public static void makeText(Context context, String text, int duration) {getInstance(context);getToast(duration);if (mInstance.layout == null || mInstance.tv == null) {LinearLayout container = new LinearLayout(mContext);LinearLayout.LayoutParams rootParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);container.setLayoutParams(rootParams);container.setBackgroundColor(DEFAULT_BG_COLOR);container.setGravity(Gravity.CENTER);mInstance.tv = new TextView(mContext);LinearLayout.LayoutParams tvParams = new LinearLayout.LayoutParams(getScreenWidth(mContext), dp2px(DEFAULT_TOAST_HEIGHT));mInstance.tv.setLayoutParams(tvParams);mInstance.tv.setPadding(dp2px(5), dp2px(2), dp2px(5), dp2px(2));mInstance.tv.setGravity(Gravity.CENTER);mInstance.tv.setTextColor(DEFAULT_TEXT_COLOR);mInstance.tv.setMaxLines(2);mInstance.tv.setEllipsize(TextUtils.TruncateAt.END);mInstance.tv.setBackgroundColor(DEFAULT_BG_COLOR);mInstance.tv.setTextSize(DEFAULT_TEXT_SIZE);container.addView(mInstance.tv);mInstance.layout = container;mToast.setView(mInstance.layout);}mInstance.tv.setText(text);mToast.show();}/** * dp轉px * * @param value * dp * @return px */public static int dp2px(float value) {float scale = mContext.getResources().getDisplayMetrics().density;return (int) (value * scale + 0.5f);}/** * 獲得屏幕寬度 * * @param context * Context * @return px */public static int getScreenWidth(Context context) {WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);DisplayMetrics outMetrics = new DisplayMetrics();wm.getDefaultDisplay().getMetrics(outMetrics);float density = outMetrics.density;return (int) (outMetrics.widthPixels * density);}}

然后直接調用就可以了

TabToast.makeText(MainActivity.this, "自定義Toast");

Demo下載地址：http://download.csdn.net/detail/qq_26787115/9391760

總結

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