Android Toast工具类

1、自定义Application

package com.example.testan;

import android.app.Application;

public class App extends Application {
	private static App appInstance;

	@Override
	public void onCreate() {
		super.onCreate();
		appInstance = this;
	}

	public static App getInstance() {
		return appInstance;
	}

}

2、Toast工具类

package com.example.testan;

import android.widget.Toast;

public class ToastUtils {

	private ToastUtils() {
		throw new AssertionError();
	}

	public static void show(int resId) {
		show(App.getInstance().getResources().getText(resId),
				Toast.LENGTH_SHORT);
	}

	public static void show(int resId, int duration) {
		show(App.getInstance().getResources().getText(resId), duration);
	}

	public static void show(CharSequence text) {
		show(text, Toast.LENGTH_SHORT);
	}

	public static void show(int resId, Object... args) {
		show(String.format(App.getInstance().getResources().getString(resId),
				args), Toast.LENGTH_SHORT);
	}

	public static void show(String format, Object... args) {
		show(String.format(format, args), Toast.LENGTH_SHORT);
	}

	public static void show(int resId, int duration, Object... args) {
		show(String.format(App.getInstance().getResources().getString(resId),
				args), duration);
	}

	public static void show(String format, int duration, Object... args) {
		show(String.format(format, args), duration);
	}

	public static void show(CharSequence text, int duration) {
		Toast.makeText(App.getInstance(), text, duration).show();
	}

}

说明：这里使用Application来获取资源文件（getResources()），因为在Fragment中使用getActivity()进行Toast存在风险（存放Fragment的Activity结束时，Fragment中可能还存在未结束的线程导致getActivity()的使用，此时getActivity()已经为空）。