android如何在子线程中弹出Toast

new Thread(){
	@Override
	public void run() {
		try {
			Looper.prepare();
			Toast.makeText(getApplicationContext(), "备份成功", 0).show();
			Looper.loop();
			} catch (Exception e) {
						
			Looper.prepare();
			Toast.makeText(getApplicationContext(), "备份失败", 0).show();
			Looper.loop();
				}
				  }
			}.start();

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原文：http://blog.csdn.net/laijunpeng/article/details/21616073