android全局dialog

public static void showErrorDialog(Context context) {
		Builder builder = new AlertDialog.Builder(context);
		builder.setMessage("程序发生异常，即将退出");
		builder.setIcon(R.drawable.image_dialog);
		builder.setNegativeButton("确定", null);
		builder.setPositiveButton("取消", null);
		AlertDialog alertDialog = builder.create();
		alertDialog.getWindow().setType(
				WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
		alertDialog.show();
	}

context 对象可以是Service，Application

<!-- 全局dialog权限 -->

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>